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LONDON, ENGLAND - APRIL 29: Prince Albert II of Monaco and Miss Charlene Wittstock arrive to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be 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. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - APRIL 29:  Prince Albert II of Monaco and Miss Charlene Wittstock arrive to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be 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.  (Photo by Chris Jackson/Getty Images)

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Grand Duke Henri and Grand Duchess Maria Teresa of Luxembourg arrive at Westminster Abbey for her wedding to Prince William and Kate Middleton. (Photo by Lewis Whyld/PA Images via Getty Images)

Grand Duke Henri and Grand Duchess Maria Teresa of Luxembourg arrive at Westminster Abbey for her wedding to Prince William and Kate Middleton.   (Photo by Lewis Whyld/PA Images via Getty Images)

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LONDON, ENGLAND - APRIL 29: Queen Margrethe II of Denmark waves as she arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be 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. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - APRIL 29:  Queen Margrethe II of Denmark waves as she arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be 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.  (Photo by Chris Jackson/Getty Images)

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Netherlands' Crown Prince Willem-Alexander and Netherland's Princess Maxima arrive at Westminster Abbey for her wedding to Prince William and Kate Middleton. (Photo by Lewis Whyld/PA Images via Getty Images)

Netherlands' Crown Prince Willem-Alexander and Netherland's Princess Maxima arrive at Westminster Abbey for her wedding to Prince William and Kate Middleton.   (Photo by Lewis Whyld/PA Images via Getty Images)