LONDON, ENGLAND - APRIL 29:   Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave Westminster Abbey following their marriage ceremony, on April 29, 2011 in London, England.  The marriage of Prince William, the second in line to the British throne, to Catherine Middleton is being held in London today. The Archbishop of Canterbury conducted the service which was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding and street parties are being held throughout the UK.   (Photo by Suzanne Plunkett-WPA Pool/Getty Images)