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Prince William and Kate Middleton during their wedding service at Westminster Abbey, London. (Photo by Andrew Milligan/PA Images via Getty Images)

Prince William and Kate Middleton during their wedding service at Westminster Abbey, London.   (Photo by Andrew Milligan/PA Images via Getty Images)

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Prince William and Kate Middleton, with her father Michael, at Westminster Abbey during their wedding service. (Photo by Andrew Milligan/PA Images via Getty Images)

Prince William and Kate Middleton, with her father Michael, at Westminster Abbey during their wedding service.   (Photo by Andrew Milligan/PA Images via Getty Images)

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Prince William and his wife Catherine, Duchess of Cambridge emerge from Westminster Abbey after the wedding ceremony. (Photo by Lewis Whyld/PA Images via Getty Images)

Prince William and his wife Catherine, Duchess of Cambridge emerge from Westminster Abbey after the wedding ceremony.   (Photo by Lewis Whyld/PA Images via Getty Images)

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Prince William and his wife Catherine, Duchess of Cambridge emerge from Westminster Abbey after the wedding ceremony. (Photo by Lewis Whyld/PA Images via Getty Images)

Prince William and his wife Catherine, Duchess of Cambridge emerge from Westminster Abbey after the wedding ceremony.   (Photo by Lewis Whyld/PA Images via Getty Images)

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Prince William and his wife Kate Middleton, who has been given the title of The Duchess of Cambridge, greet the crowds on the balcony of Buckingham Palace, London, following their wedding at Westminster Abbey. (Photo by Chris Ison/PA Images via Getty Images)

Prince William and his wife Kate Middleton, who has been given the title of The Duchess of Cambridge, greet the crowds on the balcony of Buckingham Palace, London, following their wedding at Westminster Abbey.   (Photo by Chris Ison/PA Images via Getty Images)