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LONDON, ENGLAND - APRIL 29: Catherine Middleton arrives in a car 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 Paul Gilham/Getty Images)

LONDON, ENGLAND - APRIL 29:  Catherine Middleton arrives in a car 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 Paul Gilham/Getty Images)

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LONDON, ENGLAND - APRIL 29: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet crowd of admirers while arriving to Buckingham Palace on April 29, 2011 in London, England. (Photo by James Devaney/FilmMagic)

LONDON, ENGLAND - APRIL 29:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet crowd of admirers while arriving to Buckingham Palace on April 29, 2011 in London, England.  (Photo by James Devaney/FilmMagic)

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LONDON - APRIL 29: TRH Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge kiss on the balcony of Buckingham Palace after getting married on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and 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. (Photo by John Stillwell - WPA/Getty Images)

LONDON - APRIL 29:  TRH Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge kiss on the balcony of Buckingham Palace after getting married on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and 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.  (Photo by John Stillwell - WPA/Getty Images)

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(FILE PHOTO) In this composite image a comparison has been made between the Royal Wedding cathedral departure images of Prince Charles, Prince of Wales and Lady Diana Spencer and that of Prince William with Catherine, Duchess of Cambridge.(Left image) The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The couple leave the cathedral after the ceremony. (Photo by Fox Photos/Hulton Archive/Getty Images)(Right image) LONDON, ENGLAND - APRIL 29: TRH Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge smile following their marriage at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and 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. (Photo by Chris Jackson/Getty Images)

(FILE PHOTO)  In this composite image a comparison has been made between the Royal Wedding cathedral departure images of Prince Charles, Prince of Wales and Lady Diana Spencer and that of Prince William with Catherine, Duchess of Cambridge.(Left image)  The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The couple leave the cathedral after the ceremony. (Photo by Fox Photos/Hulton Archive/Getty Images)(Right image)  LONDON, ENGLAND - APRIL 29:  TRH Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge smile following their marriage at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and 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.  (Photo by Chris Jackson/Getty Images)

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LONDON, ENGLAND - APRIL 29: Prince William takes the hand of his bride Catherine Middleton, now to be known as Catherine, Duchess of Cambridge, followed by Prince Harry and Pippa Middleton as they walk down the aisle inside Westminster Abbey 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 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 Kirsty Wigglesworth - WPA Pool/Getty Images)

LONDON, ENGLAND - APRIL 29: Prince William takes the hand of his bride Catherine Middleton, now to be known as Catherine, Duchess of Cambridge, followed by Prince Harry and Pippa Middleton as they walk down the aisle inside Westminster Abbey 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 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  Kirsty Wigglesworth - WPA Pool/Getty Images)