Britain's Catherine, Duchess of Cambridge, looks on as Prince George plays with a bubble gun at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William and Princess Charlotte look on as Prince George plays with a bubble gun at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William and Catherine, Duchess of Cambridge, look on as Prince George plays with a bubble gun and Princess Charlotte plays with baloons at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William and Catherine, Duchess of Cambridge, look on as Prince George plays with a bubble gun at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Princess Charlotte plays with baloons at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge, and Prince George attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie TPX IMAGES OF THE DAY

Britain's Catherine, Duchess of Cambridge, and Princess Charlotte watch a man inflate a balloon at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William (2nd R), Catherine, Duchess of Cambridge (2nd L), Prince George and Princess Charlotte (L) watch as a man inflates balloons at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge, and Princess Charlotte play with a balloon at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge (L), and Princess Charlotte attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince George watches as bubbles are blown at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William (2nd R), Catherine, Duchess of Cambridge (2nd L), Prince George and Princess Charlotte (L) watch as a man inflates balloons at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince William (R), Catherine, Duchess of Cambridge (2nd L), Prince George and Princess Charlotte (R) attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge (L), and Princess Charlotte attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge (L), and Princess Charlotte attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

Britain's Prince George watches as bubbles are blown at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie 

U.S. Democratic presidential nominee Hillary Clinton gestures to the crowd at a campaign rally in Raleigh, North Carolina, U.S. September 27, 2016. REUTERS/Brian Snyder 

U.S. Democratic presidential nominee Hillary Clinton laughs as she takes the stage at a campaign rally in Raleigh, North Carolina, U.S. September 27, 2016. REUTERS/Brian Snyder TPX IMAGES OF THE DAY

Former U.S. President Bill Clinton (C) greets family members of Republican U.S. presidential nominee Donald Trump prior to the first presidential debate of the 2016 election at Hofstra University in Hempstead, New York, U.S., September 26, 2016. REUTERS/Brian Snyder

Promoter Don King arrives in the debate hall prior to the first presidential debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Hofstra University in Hempstead, New York, U.S., September 26, 2016. REUTERS/Brian Snyder

Dallas Mavericks owner Mark Cuban arrives at the U.S. presidential debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Hofstra University in Hempstead, New York, U.S., September 26, 2016. REUTERS/Brian Snyder

Texas Governor and Republican presidential candidate George W. Bush (R) and Democratic presidential candidate Vice President Al Gore speak during their presidential debate at the University of Massachusetts in Boston, U.S., October 3, 2000. REUTERS/Peter Morgan/File Photo 

Republican presidential candidate and Texas Governor George W. Bush (L) and Democratic presidential candidate U.S. Vice President Al Gore both gesture toward moderator Jim Lehrer during the town hall-style presidential debate at Washington University in St. Louis, U.S., October 17, 2000. REUTERS/Jeff Mitchell/File Photo 

Democratic Presidential nominee Governor Bill Clinton (L) Independent candidate Ross Perot (C) and President George Bush laugh at the conclusion of their Presidential debate in East Lansing, Michigan, U.S., October 19th, 1992. REUTERS/Mark Cardwell/File Photo 

Democratic presidential candidate Govenor Bill Clinton makes a point as Republican candidate President George Bush disagrees, during their third and final presidential debate in East Lansing, Michigan, U.S., October 19th, 1992. REUTERS/Mark Cardwell/File Photo 

U.S. Republican presidential candidate John McCain (L) and U.S. Democratic presidential candidate Barack Obama (R) take part in their first 2008 U.S. presidential debate at the University of Mississippi in Oxford, Mississippi, U.S., September 26, 2008. REUTERS/Jim Bourg/File Photo 

President Clinton reaches out to hug his wife Hillary following his debate with Republican presidential candidate Bob Dole at the University of San Diego in San Diego, California, U.S., October 16, 1996. REUTERS/Gary Hershorn/File Photo 

President Bill Clinton (R) strolls away from his podium to talk to the audience as Republican presidential candidate Bob Dole watches during their second and final debate in San Diego, California, U.S., October 16, 1996. REUTERS/Win McNamee/File Photo 

Emily Blunt arrives at the World premiere of "The Girl on the Train" at Leicester Square in London, Britain September 20, 2016. REUTERS/Dylan Martinez

Emily Blunt chats with Luke Evans as she arrives at the World premiere of "The Girl on the Train" at Leicester Square in London, Britain September 20, 2016. REUTERS/Dylan Martinez

Keegan-Michael Key (L) and Jordan Peele pose backstage with their award for Outstanding Variety Sketch Series for "Key & Peele" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni TPX IMAGES OF THE DAY

Actress Julia Louis-Dreyfus poses backstage with her award for Outstanding Lead Actress In A Comedy Series for her role in HBO's "Veep" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni 

Keegan-Michael Key (L) and Jordan Peele pose backstage with their award for Outstanding Variety Sketch Series for "Key & Peele" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni 

Keegan-Michael Key (L) and Jordan Peele pose backstage with their award for Outstanding Variety Sketch Series for "Key & Peele" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni 

Keegan-Michael Key (L) and Jordan Peele pose backstage with their award for Outstanding Variety Sketch Series for "Key & Peele" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni 

Keegan-Michael Key (L) and Jordan Peele pose backstage with their award for Outstanding Variety Sketch Series for "Key & Peele" at the 68th Primetime Emmy Awards in Los Angeles, California U.S., September 18, 2016. REUTERS/Mario Anzuoni 

Producer Colin Firth arrives on the red carpet for the film "Loving" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 11, 2016. REUTERS/Mark Blinch

Actress Reese Witherspoon arrives on the red carpet for the film "Sing" during the Toronto International Film Festival (TIFF) in Toronto, Canada, September 11, 2016. REUTERS/Mark Blinch

Actress Scarlett Johansson arrives on the red carpet for the film "Sing" during the Toronto International Film Festival (TIFF) in Toronto, Canada, September 11, 2016. REUTERS/Mark Blinch

Actress Scarlett Johansson arrives on the red carpet for the film "Sing" during the Toronto International Film Festival (TIFF) in Toronto, Canada, September 11, 2016. REUTERS/Mark Blinch

Actor Matthew McConaughey arrives on the red carpet for the film "Sing" during the Toronto International Film Festival (TIFF) in Toronto, Canada, September 11, 2016. REUTERS/Mark Blinch

AItalian singer Francesca Michielin, author of the soundtrack, attends the red carpet for the movie "Piuma" at the 73rd Venice Film Festival in Venice, Italy September 5, 2016. REUTERS/Alessandro Bianchi 

AItalian singer Francesca Michielin, author of the soundtrack, attends the red carpet for the movie "Piuma" at the 73rd Venice Film Festival in Venice, Italy September 5, 2016. REUTERS/Alessandro Bianchi 

A man bails off his surfboard at Rockaway Beach in Queens, New York on Labor Day where waves were high due to post-tropical cyclone Hermine which tracked off the east coast of the U.S. September 5, 2016. REUTERS/Mark Kauzlarich 

Director Roan Johnson (C) poses with actors Blu Yoshimi (L) and Luigi Fedele as they attend the photocall for the movie "Piuma" at the 73rd Venice Film Festival in Venice, Italy September 5, 2016. REUTERS/Alessandro Bianchi 

Director Mel Gibson (L) and actor Hugo Weaving attend the red carpet for the movie "Hacksaw Ridge" at the 73rd Venice Film Festival in Venice, Italy September 4, 2016. REUTERS/Alessandro Bianchi 

Actor Mel Gibson attends the photocall for the movie "Hacksaw Ridge" at the 73rd Venice Film Festival in Venice, Italy September 4, 2016. REUTERS/Alessandro Bianchi 

Actor Mel Gibson attends the photocall for the movie "Hacksaw Ridge" at the 73rd Venice Film Festival in Venice, Italy September 4, 2016. REUTERS/Alessandro Bianchi 

Actor Mel Gibson (L) arrives at the photocall for the movie "Hacksaw Ridge" at the 73rd Venice Film Festival in Venice, Italy September 4, 2016. REUTERS/Alessandro Bianchi 

Actor Jude Law attends the photocall for the television miniseries "The Young Pope" at the 73rd Venice Film Festival in Venice, Italy, September 3, 2016. REUTERS/Alessandro Bianchi 

Actor Jude Law (R) chats with actress Ludivine Sagnier as they attend the photocall for the movie "The Young Pope" at the 73rd Venice Film Festival in Venice, Italy September 3, 2016. REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY 

Actress Paula Beer reacts as she attends the photocall for the movie "Frantz" at the 73rd Venice Film Festival in Venice, Italy September 3, 2016. REUTERS/Alessandro Bianchi 

Catherine, Duchess of Cambridge looks on as she attends an activity of the Wave Project, an organisation that uses surfing as a tool to reduce anxiety in children and improve their mental wellbeing, on Newquay's Town Beach, Britain September 1, 2016. REUTERS/Arthur Edwards/Pool 

Catherine, Duchess of Cambridge reacts as she attends an activity of the Wave Project, an organisation that uses surfing as a tool to reduce anxiety in children and improve their mental wellbeing, on Newquay's Town Beach, Britain September 1, 2016. REUTERS/Arthur Edwards/Pool 

Catherine, Duchess of Cambridge reacts as she attends an activity of the Wave Project, an organisation that uses surfing as a tool to reduce anxiety in children and improve their mental wellbeing, on Newquay's Town Beach, Britain September 1, 2016. REUTERS/Arthur Edwards/Pool 

Catherine, Duchess of Cambridge reacts as she attends an activity of the Wave Project, an organisation that uses surfing as a tool to reduce anxiety in children and improve their mental wellbeing, on Newquay's Town Beach, Britain September 1, 2016. REUTERS/Arthur Edwards/Pool 

Republican presidential nominee Donald Trump leaves a campaign rally in Charlotte, North Carolina, U.S., August 18, 2016. REUTERS/Carlo Allegri 

Democratic presidential nominee Hillary Clinton and her husband former president Bill Clinton react to the balloon drop after she accepted the nomination on the fourth and final night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 28, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY 

Democratic presidential nominee Hillary Clinton and her husband former president Bill Clinton react to the balloon drop after she accepted the nomination on the fourth and final night at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 28, 2016. REUTERS/Jim Young