Will and Kate at "War Horse" royal premiere

Prince William and Kate, Duchess of Cambridge, attend the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Kate, Duchess of Cambridge, attends the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London. It was the first royal premiere for the Duchess of Cambridge.

Pictures: Prince William and Kate

The Duke and Duchess of Cambridge attend the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London. The charity event was for the benefit of the Foundation of Prince William and Prince Harry.

Pictures: Prince William and Kate

Director Steven Spielberg pats Joey, the four-legged star of "War Horse," during the U.K. premiere of the film at Odeon Leicester Square on Jan. 8, 2012, in London.

Director Steven Spielberg and actor Jeremy Irvine pose with Joey during the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London. Approximately 600 current and former members of the military and their families were joined by the film's cast members.

Director Steven Spielberg attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Kate, Duchess of Cambridge, attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Kate, Duchess of Cambridge, attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012 in London.

Pictures: Prince William and Kate

Prince William and Kate, Duchess of Cambridge, attend the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

The Duke and Duchess of Cambridge attend the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Kate, Duchess of Cambridge, attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Prince William attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Prince William talks with actor Tom Hiddleston as he attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Prince William attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Prince William and Kate, Duchess of Cambridge, attend the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Kate, Duchess of Cambridge, attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Pictures: Prince William and Kate

Actor Jeremy Irvine attends the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London.

"War Horse" actress Emily Watson attends the film's U.K. premiere at Odeon Leicester Square on Jan. 8, 2012, in London.

"War Horse" actress Celine Buckens attends the film's U.K. premiere at Odeon Leicester Square on Jan. 8, 2012, in London.

Actor Benedict Cumberbatch attends the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London.

Actress Jessica Brown-Findlay ("Downton Abbey") attends the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London.

"War Horse" author Michael Morpurgo attends the U.K. premiere of Steven Spielberg's film adaptation at Odeon Leicester Square on Jan. 8, 2012, in London.

Presenter Emma Freud attends the U.K. premiere of "War Horse" at the Odeon Leicester Square on Jan. 8, 2012, in London.

Actress Miranda Richardson attends the U.K. premiere of "War Horse" at Odeon Leicester Square on Jan. 8, 2012, in London.