A Sotheby's employee holds a rare 52.82-carat white diamond ring at Sotheby's auction house on April 12, 2010 in London, England. Price: 7 million USD. (Photo by Dan Kitwood/Getty Images)

Sir Paul McCartney and Nancy Shevell leave the Marylebone Registry Office after their civil ceremony marriage on October 9, 2011 in London, England. (Photo by Danny Martindale/Getty Images)

A woman views a painting by American artist George Condo entitled “Jesus” on October 17, 2011 in London, England. (Photo by Oli Scarff/Getty Images)

The Bratz Rock Angels are displayed at the Dream Toys 2005 Pre-Christmas Expo on October 5, 2005 in London. (Photo by Daniel Berehulak/Getty Images)

The original costumes for Star Wars character Darth Vader stand on display at “Star Wars: The Exhibition” at County hall on May 04, 2007 in London, England. (Photo by MJ Kim/Getty Images)

Festive characters perform during Harrods 26th Annual Christmas Parade on November 5, in London, England. (Photo by Steve Finn/Harrods via Getty Images)

Bunting hangs on Regent Street on April 19, 2011 in London, England. Preparations are underway across the city as the Royal wedding of HRH Prince William and Kate Middleton draws nearer. (Photo by Dan Kitwood/Getty Images)

Lance Sergent Martin Mitchell (R) pins medals to Coldstream Guardsman Martin Hughes in the Tailor Shop in Wellington Barracks on April 20, 2011 in London, England. Soldiers involved in the Royal Wedding of Prince William and Catherine Middleton are preparing their ceremonial duties ahead of the day. (Photo by Oli Scarff/Getty Images)