Britain's Princes William (L) and Harry (R) and Catherine, Duchess of Cambridge (C) look on as Great Britain's rider Kristina Cook competes during the Jumping Phase of the Eventing competition of the 2012 London Olympics at the Equestrian venue in Greenwich Park, London, on July 31, 2012. AFP PHOTO / CARL COURT        (Photo credit should read CARL COURT/AFP/GettyImages)