( L to R) Belgium's Princess Claire, Prince Laurent, Princess Astrid, and Prince Lorenz stand on the balcony of the Royal Palace in Brussels July 21, 2013. Belgium is celebrating its National Day, which also marks the abdication of King Albert II of Belgium and the investiture of his eldest son Philippe. REUTERS/Yves Herman (BELGIUM - Tags: ROYALS ENTERTAINMENT) (KING-BELGIUM) 

( L to R) Belgium's Princess Claire, Prince Laurent, Princess Astrid, and Prince Lorenz stand on the balcony of the Royal Palace in Brussels July 21, 2013. Belgium is celebrating its National Day, which also marks the abdication of King Albert II of Belgium and the investiture of his eldest son Philippe. REUTERS/Yves Herman (BELGIUM - Tags: ROYALS ENTERTAINMENT) (KING-BELGIUM) 

Belgium's (front row, L-R) Queen Paola and King Albert II applaud Crown Prince Philippe and Crown Princess Mathilde at a Te Deum mass celebrating the 20th anniversary of the reign of Belgium's King Albert II, the Belgian National Day, King Albert's abdication and the inauguration of his successor King Philippe, at St Gudule Cathedral in Brussels July 21, 2013. Princess Astrid, Princess Claire and Prince Laurent (2R) stand behind. REUTERS/Kevin Coombs (BELGIUM - Tags: ENTERTAINMENT ROYALS RELIGION TPX IMAGES OF THE DAY) (KING-BELGIUM) 

Belgium's Crown Prince Philippe and Crown Princess Mathilde are followed by Prince Laurent and Princess Astrid and Prince Lorenz and Princess Claire as they arrive at a Te Deum mass celebrating the 20th anniversary of the reign of Belgium's King Albert II, the Belgian National Day, King Albert's abdication and the inauguration of his successor King Philippe, at St Gudule Cathedral in Brussels July 21, 2013. REUTERS/Kevin Coombs (BELGIUM - Tags: ENTERTAINMENT ROYALS RELIGION) (KING-BELGIUM) 

Belgium's (front row, L-R) Queen Paola and King Albert II applaud Crown Prince Philippe and Crown Princess Mathilde at a Te Deum mass celebrating the 20th anniversary of the reign of Belgium's King Albert II, the Belgian National Day, King Albert's abdication and the inauguration of his successor King Philippe, at St Gudule Cathedral in Brussels July 21, 2013. Princess Astrid, Princess Claire and Prince Laurent (2R) stand behind. REUTERS/Kevin Coombs (BELGIUM - Tags: ENTERTAINMENT ROYALS RELIGION) (KING-BELGIUM) 

Belgium's royal family (front row, L-R) Queen Fabiola, Queen Paola, King Albert II, Crown Prince Philippe and Crown Princess Mathilde attend a Te Deum mass celebrating the 20th anniversary of the reign of Belgium's King Albert II, the Belgian National Day, King Albert's abdication and the inauguration of his successor King Philippe, at St Gudule Cathedral in Brussels July 21, 2013. Prince Lorenz, Princess Astrid, Princess Claire and Prince Laurent (L-R) stand behind. REUTERS/Kevin Coombs (BELGIUM - Tags: ENTERTAINMENT ROYALS RELIGION) (KING-BELGIUM) 

1st row, L-R: Belgium's Princess Claire, Prince Laurent, Princess Mathilde, Queen Paola, King Albert II, Queen Fabiola, Princess Astrid and Prince Lorenz pose with jury members of the Queen Elisabeth music competition at the Laeken castle in Brussels May 28, 2013. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT ROYALS) 

From L-R: Belgium's Princess Claire, Prince Laurent and Princess Mathilde pose with jury members of the Queen Elisabeth music competition at the Laeken castle in Brussels May 28, 2013. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT ROYALS) 

From L-R: Belgium's Princess Claire, Prince Laurent, Princess Mathilde, Queen Paola, King Albert II and Queen Fabiola pose with jury members of the Queen Elisabeth music competition at the Laeken castle in Brussels May 28, 2013. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT ROYALS) 

Belgian Crown Prince Philippe, Princess Mathilde, Queen Paola, Queen Fabiola, Princess Claire and Prince Laurent (L-R) pose next to a Christmas tree ahead of a traditional Christmas concert at the Brussels Royal Palace December 19, 2012. REUTERS/Eric Vidal (BELGIUM - Tags: ROYALS ENTERTAINMENT SOCIETY) 

Belgium's Princess Claire and Prince Laurent attend a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family and members of the government pose for a family photo during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2012. Pictured are (L-R first row) Prince Laurent, Princess Claire, Princess Mathilde, Crown Prince Philippe, Princess Astrid and Prince Lorenz. REUTERS/Francois Lenoir (BELGIUM - Tags: POLITICS ROYALS) 

Belgium's royal family and members of the government pose for a family photo during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2012. Pictured are (L-R first row) Prince Laurent, Princess Claire, Princess Mathilde, Crown Prince Philippe, Princess Astrid and Prince Lorenz. REUTERS/Francois Lenoir (BELGIUM - Tags: POLITICS ROYALS) 

Belgium's royal family (1st Row L-R) Princess Claire, Prince Laurent, Princess Mathilde, Crown Prince Philippe, Princess Astrid and Prince Lorenz attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent and Princess Claire leave a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent and Princess Claire leave a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent (R) and Princess Claire leave the religious wedding service of Luxembourg's Hereditary Grand Duke Guillaume and Princess Stephanie, Hereditary Grand Duchess of Luxembourg, at the Notre-Dame Cathedral in Luxembourg October 20, 2012. REUTERS/Francois Lenoir (LUXEMBOURG - Tags: ROYALS SOCIETY ENTERTAINMENT)

Belgium's Prince Laurent (R) and Princess Claire leave the religious wedding service of Luxembourg's Hereditary Grand Duke Guillaume and Princess Stephanie, Hereditary Grand Duchess of Luxembourg, at the Notre-Dame Cathedral in Luxembourg October 20, 2012. REUTERS/Vincent Kessler (LUXEMBOURG - Tags: ROYALS SOCIETY ENTERTAINMENT)

Belgium's Prince Laurent (R) and Princess Claire arrive at the religious wedding service of Luxembourg's Hereditary Grand Duke Guillaume and Countess Stephanie de Lannoy at the Notre-Dame Cathedral in Luxembourg October 20, 2012. REUTERS/Vincent Kessler (LUXEMBOURG - Tags: ROYALS SOCIETY ENTERTAINMENT)

Belgian Crown Prince Laurent (3rd L), his wife Princess Claire (2nd R) and their children Princess Louise and Prince Nicolas (R) arrive at a polling station before casting their ballots for Belgium's local election in Tervuren October 14, 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: POLITICS ELECTIONS ROYALS ENTERTAINMENT) 

Belgium's royal family (top, L-R) Princess Claire, Prince Laurent, Crown Princess Mathilde, Crown Prince Philippe, Princess Astrid, Prince Lorenz, Prince Joachim, Prince Amedeo, (middle, L-R) Princess Louise, Prince Aymeric, Prince Nicolas, Prince Gabriel, (bottom, L-R) Princess Elisabeth, Princess Eleonore, Queen Paola, Prince Emmanuel, King Albert II and Princess Laetitia Maria pose for a photo at the private garden of Laeken castle in Brussels September 2, 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: ENTERTAINMENT ROYALS) 

Belgium's Princess Claire (top L) kisses Prince Laurent, near (bottom L-R) Prince Aymeric, Princess Louise and Prince Nicolas while posing for a photo at the private garden of Laeken castle in Brussels September 2, 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: ENTERTAINMENT ROYALS) 

Belgium's royal family (top, L-R) Princess Claire, Prince Laurent, Crown Princess Mathilde, Crown Prince Philippe, Princess Astrid, Prince Lorenz, Joachim, Amadeo (middle, L-R) Princess Louise, Prince Aymeric, Prince Nicolas, Prince Gabriel, Laetitia Maria, (seated, L-R) Princess Elisabeth, Princess Eleonore, Queen Paola, Prince Emmanuel, King Albert II and Queen Fabiola pose for the photographer at the private garden of Laeken castle in Brussels, September 2 , 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: ROYALS ENTERTAINMENT) 

Belgium's royals family (top, L-R) Princess Claire, Prince Laurent, Crown Princess Mathilde, Crown Prince Philippe, Princess Astrid, Prince Lorenz, Joachim, Amadeo, (middle, L-R) Princess Louise, Prince Aymeric, Prince Nicolas, Prince Gabriel, Laetitia Maria (front, 2nd L-R) Queen Fabiola, Princess Elisabeth ,Princess Eleonore, Queen Paola, Prince Emmanuel, and King Albert II prepare to pose for the photographer on the private garden of Laeken castle in Brussels, September 2 , 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: ROYALS ENTERTAINMENT) 

Belgium's royal family (top, L-R) Princess Claire, Prince Laurent, Crown Princess Mathilde, Crown Prince Philippe, Princess Astrid, Prince Lorenz, Joachim, Amadeo (middle, L-R) Princess Louise, Prince Aymeric, Prince Nicolas, Prince Gabriel, Laetitia Maria, (seated, L-R) Princess Elisabeth, Princess Eleonore, Queen Paola, Prince Emmanuel, King Albert II and Queen Fabiola pose for the photographer at the private garden of Laeken castle in Brussels, September 2 , 2012. REUTERS/Laurent Dubrule (BELGIUM - Tags: ROYALS ENTERTAINMENT) 

Belgium's Princess Claire (C), Prince Aymeric (L) and Prince Nicolas (R) watch the traditional military parade on National Day in front of the Royal Palace in Brussels July 21, 2012. Belgium celebrates its national day and its 182nd anniversary of independence on Saturday. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS ROYALS ANNIVERSARY) 

Belgium's Princess Claire (L), Prince Aymeric (bottom L), Prince Laurent (top R) and Prince Nicolas (bottom R) watch the traditional military parade on National Day in front of the Royal Palace in Brussels July 21, 2012. Belgium celebrates its national day and its 182nd anniversary of independence on Saturday. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS ROYALS ANNIVERSARY) 

Belgium's Princess Claire (back L), Prince Aymeric (front L), Prince Laurent (back R) and Prince Nicolas watch the traditional military parade to commemorate National Day in front of the Royal Palace in Brussels July 21, 2012. Belgium celebrates its national day and its 182nd anniversary of independence on Saturday. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS ROYALS ANNIVERSARY) 

Belgium's Prince Nicolas (R) wears a cap belonging to his father Prince Laurent (back R) while his mother Princess Claire and his brother Prince Aymeric watch the traditional military parade to commemorate National Day in front of the Royal Palace in Brussels July 21, 2012. Belgium celebrates its national day and its 182nd anniversary of independence on Saturday. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS ROYALS ANNIVERSARY) 

Belgium's Prince Nicolas (R) wears a cap belonging to his father Prince Laurent (back R) while his mother Princess Claire and his brother Prince Aymeric watch the traditional military parade to commemorate National Day in front of the Royal Palace in Brussels July 21, 2012. Belgium celebrates its national day and its 182nd anniversary of independence on Saturday. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS ROYALS ANNIVERSARY) 

Prince Laurent and his wife Princess Claire take part in a party celebrating Princess Astrid's birthday in Brussels June 2, 2012. Princess Astrid will be 50 years old on June 5, 2012. REUTERS/Yves Herman (BELGIUM - Tags: ROYALS) 

Belgium's Princess Claire and Prince Laurent pose after a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Princess Claire and Prince Laurent leave a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Princess Claire (L) and Prince Laurent pose after a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: PROFILE RELIGION ROYALS ENTERTAINMENT) 

(L-R) Belgium's Princess Mathilde, Princess Claire and Prince Laurent attend a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: PROFILE RELIGION ROYALS ENTERTAINMENT) 

Belgium's Princess Claire (L) and Prince Laurent greet the crowd after a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: PROFILE RELIGION ROYALS ENTERTAINMENT) 

Belgium's Princess Claire and Prince Laurent (R) attend a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: PROFILE RELIGION ROYALS ENTERTAINMENT) 

(L-R) Belgium's Queen Paola, King Albert II, Crown Prince Philippe, Princess Mathilde, Princess Claire and Prince Laurent attend a mass in memory of former members of the royal family at Notre Dame de Laeken church in Brussels February 16, 2012. REUTERS/Francois Lenoir (BELGIUM - Tags: PROFILE RELIGION ROYALS) 

Belgium's Princess Claire drinks a beer after a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS HEADSHOT ENTERTAINMENT) 

Belgium's royal family listen to a speech during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. Pictured are (L-R 1st row) Prince Laurent, Princess Claire, Princess Mathilde, Prince Philippe, Princess Astrid and Prince Lorenz. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT) 

Belgium's royal family listen to a speech during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. Picture are (L-R 1st row) Prince Laurent, Princess Claire, Princess Mathilde, Prince Philippe, Princess Astrid and Prince Lorenz. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT) 

Belgium's Princess Claire attends a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT HEADSHOT) 

Belgium's Prince Laurent (L) and his wife Princess Claire listen to a speech during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT) 

Belgium's Prince Laurent (L) and his wife Princess Claire listen to a speech during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT) 

Belgium's Prince Laurent (L), Princess Claire (2nd L), Princess Mathilde (2nd R) and Prince Philippe pose for a family photo with members of the Government during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS ENTERTAINMENT) 

Belgium's royal family and members of the government pose for a family photo during a ceremony in honour of King's Day, at the Belgian Parliament in Brussels November 15, 2011. Pictured are (from L-R first row) Prince Laurent, Princess Claire, Princess Mathilde, Prince Philippe, Princess Astrid and Prince Lorenz. REUTERS/Thierry Roge (BELGIUM - Tags: ROYALS POLITICS) 

Belgium's Prince Laurent and his wife Princess Claire (front) greet the crowd after a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent (R) watches his wife Princess Claire as they greet the crowd after a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Princess Claire leaves a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS HEADSHOT) 

A combination photo shows Belgium's Prince Laurent (R) talking to his wife Princess Claire during a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: RELIGION ROYALS ENTERTAINMENT) 

Belgium's royal family (1st Row L-R) Prince Lorenz, Princess Astrid, Queen Fabiola, Crown Prince Philippe, Princess Mathilde, Princess Claire and Prince Laurent attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family (1st Row L-R) Queen Fabiola, Crown Prince Philippe, Princess Mathilde, Princess Claire and Prince Laurent attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent talks to Princess Mathilde (L), while holding his wife Princess Claire (R), during a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: RELIGION ROYALS ENTERTAINMENT) 

Belgium's Prince Laurent and Princess Claire smile as they leave a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Laurent and Princess Claire smile as they leave a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2011. (From 1st Row L-R) Prince Lorenz, Princess Astrid, Queen Fabiola, Crown Prince Philippe, Princess Mathilde, Princess Claire and Prince Laurent. REUTERS/Francois Lenoir (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Prince Albert II of Monaco (C) poses with his sisters Princess Caroline of Hanover (L) ,Princess Stephanie (2nd L), actors Cyrielle Clair (2nd R) and Olivier Lejeune (R) before the gala celebrating the 30th anniversary of the Princess Grace theatre in Monte Carlo October 3, 2011. REUTERS/Eric Gaillard (MONACO - Tags: ENTERTAINMENT ROYALS) 

Prince Albert II of Monaco (C) poses with his sisters Princess Caroline of Hanover (L) ,Princess Stephanie (2ndL), actors Cyrielle Clair (2nd R) and Olivier Lejeune (R) before the gala celebrating the 30th anniversary of the Princess Grace theatre in Monte Carlo October 3, 2011. REUTERS/Eric Gaillard (MONACO - Tags: ENTERTAINMENT ROYALS) 

Prince Albert II of Monaco (C) poses with his sisters Princess Caroline of Hanover (L) ,Princess Stephanie (2ndL), actors Cyrielle Clair (2nd R) and Olivier Lejeune (R) before the gala celebrating the 30th anniversary of the Princess Grace theatre in Monte Carlo October 3, 2011. REUTERS/Eric Gaillard (MONACO - Tags: ENTERTAINMENT ROYALS) 

Belgium's Prince Laurent (R) attends the National Ball with his wife Princess Claire (2nd L) and his children Prince Aymeric (L), Prince Nicolas (C) and Princess Louise (2nd R) in Brussels July 20, 2011, a day before the Belgian national day. REUTERS/Eric Vidal (BELGIUM - Tags: ROYALS)