CAPTION CORRECTS DATE PHOTO WAS TAKEN TO 1994 FILE - In this 1994 file photo, Diana, Princess of Wales walks during a party given at the Serpentine Gallery in London. The same day that Charles admitted he was unfaithful to Diana during a TV interview, Diana appeared at the Serpentine Gallery in what was dubbed her revenge dress, a figure-hugging, low cut, off-the-shoulder little black outfit. (AP Photo/File)