Cricket - Australia v South Africa - Third Test cricket match - Adelaide Oval, Adelaide, Australia - 23/11/16. Australian test debutante Peter Handscomb drops the ball as Usman Khawaja (L) and wicketkeeper Matthew Wade watch during practice at the Adelaide Oval. REUTERS/Jason Reed 

Cricket - Australia v South Africa - Third Test cricket match - Adelaide Oval, Adelaide, Australia - 23/11/16. Australian test debutante Peter Handscomb drops the ball as Usman Khawaja (L) and wicketkeeper Matthew Wade watch during practice at the Adelaide Oval. REUTERS/Jason Reed 

Italian actress Elisabetta Canalis (L) and German model Cathy Lugner watch the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Guests watch the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Guests dance during Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY TPX IMAGES OF THE DAY) 

Guests dance during Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Opera singer Aida Garifullina performs during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT TPX IMAGES OF THE DAY) 

Opera singer Aida Garifullina performs during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Opera singer Carlos Alvarez performs during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Opera singer Olga Bezsmertna perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY TPX IMAGES OF THE DAY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers perform during the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers wait before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

A dancer puts on her shoes before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers wait before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

Dancers wait before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

A dancer puts on her dress before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

A dancer puts on her shoes before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

A dancer waits before the opening ceremony of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY) 

The State Opera is illuminated ahead of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: CITYSCAPE ENTERTAINMENT SOCIETY) 

Italian actress Elisabetta Canalis poses in a dress by British designer Vivienne Westwood ahead of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Italian actress Elisabetta Canalis poses in a dress by British designer Vivienne Westwood with her host Austrian businessman Richard Lugner ahead of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Italian actress Elisabetta Canalis (C) poses in a dress by British designer Vivienne Westwood with her host Austrian businessman Richard Lugner (R) and his wife Cathy ahead of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Italian actress Elisabetta Canalis poses in a dress by British designer Vivienne Westwood with her host Austrian businessman Richard Lugner ahead of the Opera Ball in Vienna February 12, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Members of the opening committee perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Members of the opening committee perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Members of the opening committee perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY TPX IMAGES OF THE DAY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Dancers of the state opera ballet perform during a dress rehearsal for the Opera Ball in Vienna February 11, 2015. The traditional ball is opened by the Austrian president and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT SOCIETY) 

Workers prepare boxes in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers prepare a part of the dance floor in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers prepare flowers in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers prepare flowers in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers lay the dance floor in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers prepare boxes in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers prepare boxes in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Workers carry a part of the dance floor in the opera house in Vienna February 10, 2015. The Viennese Opera Ball is opened by the Austrian President and features a musical programme with solists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with Johann Strauss' danube waltz. The traditional ball takes place on February 12, with tickets starting at 250 euros ($340) and a box as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY ENTERTAINMENT) 

Debutantes dressed for the Opera Ball pose with opera director Dominique Meyer during the Opera Ball news conference in Vienna January 20, 2015. The traditional Vienna Opera Ball takes place on February 12. REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT)

Debutantes dressed for the Opera Ball pose during the Opera Ball news conference in Vienna January 20, 2015. The traditional Vienna Opera Ball takes place on February 12. REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT)

Debutantes dressed for the Opera Ball pose with ball organizer Desiree Treichl-Stuergkh during the Opera Ball news conference in Vienna January 20, 2015. The traditional Vienna Opera Ball takes place on February 12. REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT)

Debutantes dressed for the Opera Ball pose with opera director Dominique Meyer (2nd L) and ball organizer Desiree Treichl-Stuergkh during the Opera Ball news conference in Vienna January 20, 2015. The traditional Vienna Opera Ball takes place on February 12. REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT)

Debutantes dressed for the Opera Ball arrive for a photo opportunity during the Opera Ball news conference in Vienna January 20, 2015. The traditional Vienna Opera Ball takes place on February 12. REUTERS/Heinz-Peter Bader (AUSTRIA - Tags: ENTERTAINMENT)

Members of the opening committee enter the dance floor at the Opera Ball in Vienna February 27, 2014. The 18 to 24-year-olds spend weeks rehearsing for a performance that lasts just three or four minutes but has a huge audience at home and abroad. Tickets for the ball start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT) 

Visitors watch the opening ceremony of the Opera Ball in Vienna February 27, 2014. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT) 

Dancers of the state opera ballet perform at the Opera Ball in Vienna February 27, 2014. The traditional ball is opened by the Austrian president and features a musical programme with soloists and artists from the Vienna Philharmonic and State Ballet before the 144 debutants and debutantes lead into the festivities with a Strauss waltz. Tickets start at 250 euros ($340) and a box costs as much as 18,500 euros ($25,000). REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENTERTAINMENT TPX IMAGES OF THE DAY)