Diana stunned twice in this pale blue Catherine Walker gown — once at the Cannes Film Festival in 1987 and one more time for attending a performance of the musical Miss Saigon in London two years later. In 2017, actress Elle Fanning went for similar Cinderella vibes as she dressed up in a strapless design by Miu Miu for the Met Gala.
Image Sources: Getty / George Pimentel and Getty / Tim Graham