Diana, Princess of Wales (1961-97, the pre-eminent female celebrity of her generation), lovely signature 'Diana' on 2-page letter on 'Kensington Palace' letterhead with 'Crowned Cd' monogram, dated July 1st 1989, to John Gairdner, thanking him for fl owers received for her 28th birthday, with original envelope with 'Registered/Buckingham Palace S.W. 1' oval postmark