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Britain'S Prince William Drives His Wife, Princess Catherine, Duchess Of Cambridge Down The Mall In London, In His Father Prince Charles' Aston Martin Volante Sports Car Covered With Bunting On Their Way To Clarence House. (Photo by John Phillips/UK Press via Getty Images)

Britain'S Prince William Drives His Wife, Princess Catherine, Duchess Of Cambridge Down The Mall In London, In His Father Prince Charles' Aston Martin Volante Sports Car Covered With Bunting On Their Way To Clarence House. (Photo by John Phillips/UK Press via Getty Images)

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LONDON, ENGLAND - APRIL 29: HRH Prince William Duke of Cambridge drives his wife HRH Catherine Duchess of Cambridge in a blue Aston Martin as they leave Buckingham Palace to Clarence House 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 Pascal Le Segretain/Getty Images)

LONDON, ENGLAND - APRIL 29:  HRH Prince William Duke of Cambridge drives his wife HRH Catherine Duchess of Cambridge in a blue Aston Martin as they leave Buckingham Palace to Clarence House 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 Pascal Le Segretain/Getty Images)

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LONDON, ENGLAND - APRIL 29: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge drive from Buckingham Palace to Clarence House in a decorated vintage Aston Martin sports car 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 Jeff J Mitchell/Getty Images)

LONDON, ENGLAND - APRIL 29:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge drive from Buckingham Palace to Clarence House in a decorated vintage Aston Martin sports car 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 Jeff J Mitchell/Getty Images)

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LONDON, ENGLAND - APRIL 29: HRH Prince William Duke of Cambridge drives his wife HRH Catherine Duchess of Cambridge in a blue Aston Martin as they leave Buckingham Palace to Clarence House 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 Jasper Juinen/Getty Images)

LONDON, ENGLAND - APRIL 29:  HRH Prince William Duke of Cambridge drives his wife HRH Catherine Duchess of Cambridge in a blue Aston Martin as they leave Buckingham Palace to Clarence House 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 Jasper Juinen/Getty Images)

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Britain'S Prince William Drives His Wife, Princess Catherine, Duchess Of Cambridge Down The Mall In London, In His Father Prince Charles' Aston Martin Volante Sports Car Covered With Bunting On Their Way To Clarence House. (Photo by John Phillips/UK Press via Getty Images)

Britain'S Prince William Drives His Wife, Princess Catherine, Duchess Of Cambridge Down The Mall In London, In His Father Prince Charles' Aston Martin Volante Sports Car Covered With Bunting On Their Way To Clarence House. (Photo by John Phillips/UK Press via Getty Images)