An assistant poses with a Catherine Walker evening gown worn by Britain's Princess Diana for the State visit to India in 1992 at the Kerry Taylor Auction house in south London on March 15, 2013 ahead of a sale of ten dresses that belonged to the Princess. The gown is expected to sell for between 80,000 - 120,000 GBP (121,000 - 182,000 USD) in the auction taking place on March 19, 2013. AFP PHOTO / LEON NEAL

A Catherine Walker evening gown worn by Britain's Princess Diana for a State Visit to Austria in 1989 is displayed at Kerry Taylor Auction house in south London on March 15, 2013 ahead of a sale of ten dresses that belonged to the Princess. The gown is expected to sell for between 30,000 - 50,000 GBP (45,000 - 76,000 USD) at the auction taking place on March 19, 2013. AFP PHOTO / LEON NEAL

** FILE ** Diana, Princess of Wales, smiles as she arrives at the Tate Gallery in London in this Tuesday July 1, 1997 file photo. A three-year inquiry into the death of Princess Diana and Dodi Fayed has concluded that allegations of murder were unfounded, and that there is no reason for suspecting the involvement of the royal family, a senior police officer said Thursday, Dec. 14, 2006.

** FILE ** Britain's Diana, Princess of Wales, arrives at the Royal Albert Hall for a gala performance of Swan Lake in this Tuesday June 3, 1997 file photo. A three-year inquiry into the death of Princess Diana and Dodi Fayed has concluded that allegations of murder were unfounded, and that there is no reason for suspecting the involvement of the royal family, a senior police officer said Thursday, Dec. 14, 2006.

** FILE ** Diana, Princess of Wales, arrives for dinner in Washington in this Tuesday Sept. 24, 1996 file photo. A three-year inquiry into the death of Princess Diana and Dodi Fayed has concluded that allegations of murder were unfounded, and that there is no reason for suspecting the involvement of the royal family, a senior police officer said Thursday, Dec. 14, 2006.

Princess Diana, Princess of Wales wearing large dog patterned red, white and black jacket and skirt smiles as she struggles to keep her from blowing off after ending the christening Princess Eugenie Victoria, the youngest daughter of the Duke and Duchess of at Sandringham Church Day in Sandringham, England on Dec. 23, 1990. Nine month-old Prince Eugenie is a niece of princess of Wales. (AP Photo)

Her Royal Highness, Princess Diana of Wales is escorted by the British Ambassador to the United States Sir Antony Acland, as she arrived at Dulles Airport in Chantilly, Va. to begin her two-day visit to Washington, Oct. 4, 1990. (AP Photo/Marcy Nighswander)

Britain's Princess Diana carriers a bouquet at the Brooklyn Academy of Music in New York on Feb. 2, 1989 as she arrives for the Welsh National Opera's American debut of "Falstaff." (AP Photo/Susan Ragan)

The Princess of Wales, Princess Diana on her arrival at the Sadler's Wells Theatre, London on March 22, 1988, for a performance given by the London City Ballet. (AP Photo/Press Association)