Britain's Prince William, the Duke of Cambridge, and his wife Catherine, Duchess of Cambridge, as she was released from King Edward VII hospital in central London earlier today. Leon Neal/AFP/Getty Images hide caption

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A special cake re-enacting the scene of Prince William, Duke of Cambridge's wedding in 2011 where he drove the car with his wife the Catherine, Duchess of Cambridge, as he attends a reception prior to the annual October Club dinner in aid of the St Giles Trust on Wednesday night. WPA Pool/Getty Images hide caption

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British Union Jack flags are all over Regent Street in London, as the city prepares for Friday's wedding. Adrian Dennis /AFP/Getty Images hide caption

itoggle caption Adrian Dennis /AFP/Getty Images