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Britain's Prince William and his wife Kate, Duchess of Cambridge, leave the 1902 State Landau as they arrive at Buckingham Palace after their wedding in central London on April 29, 2011. AFP PHOTO / WPA POOL / Andrew Winning (Photo credit should read ANDREW WINNING/AFP/Getty Images)

Britain's Prince William and his wife Kate, Duchess of Cambridge, leave the 1902 State Landau as they arrive at Buckingham Palace after their wedding in central London on April 29, 2011. AFP PHOTO / WPA POOL / Andrew Winning (Photo credit should read ANDREW WINNING/AFP/Getty Images)