Britain's Prince William and his wife Catherine, Duchess of Cambridge, disembark from Her Majesty's Canadian Ship Montreal on their arrival in Quebec City, on the fourth day of their nine-day tour of Canada on July 3, 2011. AFP PHOTO/Adrian Wyld/Pool (Photo credit should read ADRIAN WYLD/AFP/Getty Images)

Britain's Prince William and his wife Catherine, Duchess of Cambridge, disembark from Her Majesty's Canadian Ship Montreal on their arrival in Quebec City, on the fourth day of their nine-day tour of Canada on July 3, 2011.       AFP PHOTO/Adrian Wyld/Pool (Photo credit should read ADRIAN WYLD/AFP/Getty Images)