Britain's Prince William (C) and his wife Catherine, Duchess of Cambridge, smile next to Peter Phillips (L) during the Eventing Jumping equestrian event at the London 2012 Olympic Games in Greenwich Park, July 31, 2012. [Photo/Agencies]

Britain's Prince William (2nd R) jokes with his cousin Peter Philips next to their wives Autumn Philips (L) and Catherine, Duchess of Cambridge, (R) during the Eventing Jumping equestrian event at the London 2012 Olympic Games in Greenwich Park, July 31, 2012. [Photo/Agencies]