William and Kate in an Aston Martin

TRH Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave Buckingham Palace driving a convertible Aston Martin car on April 29, 2011, in London. The pair drove to Clarence House, where they'll stay until they return to the palace for an evening reception.

Britain's Prince William drives his wife, Catherine, Duchess of Cambridge, away from Buckingham Palace in a vintage Aston Martin Volante convertible after their wedding at London's Westminster Abbey, Friday, April, 29, 2011.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, drive from Buckingham Palace in a decorated vintage Aston Martin sports car on April 29, 2011 in London.

Britain's Prince William drives his wife, Catherine, Duchess of Cambridge, out of Buckingham Palace in London in his father Prince Charles' Aston Martin Volante sports car covered with bunting on their way to Clarence House after their wedding in London's Westminster Abbey, Friday April 29, 2011.

Britain's Prince William and his wife, Catherine, Duchess of Cambridge, drive away from Buckingham Palace in a convertible after the royal wedding in London Friday, April, 29, 2011.

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.

Britain's Prince William and his wife, Catherine, Duchess of Cambridge, drive away from Buckingham Palace in a convertible after the royal wedding in London, Friday, April, 29, 2011.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge drive from Buckingham Palace in a decorated sports car on April 29, 2011, in London.

Britain's Prince William and his wife, Catherine, Duchess of Cambridge, drive away from Buckingham Palace in a convertible after the royal wedding in London Friday, April, 29, 2011.

Britain's Prince William drives himself and his wife, Catherine, Duchess of Cambridge, as they leave Buckingham Palace for Clarence House following ineir wedding in London, Friday April 29, 2011. The car is a vintage Aston Martin Volante.