Britain's Princess Beatrice, Princess Eugenie, Prince William and his wife Catherine, Duchess of Cambridge, and Prince Harry (centre row, L-R) wave and applaud during the eventing individual jumping final equestrian event at the London 2012 Olympic Games in Greenwich Park July 31, 2012. [Photo/Agencies]

Britain's Prince William applauds during their men's preliminary round Group B water polo match against Serbia at the Water Polo Arena at the London 2012 Olympic Games July 31, 2012. [Photo/Agencies]