The dress was ruched, curve-hugging and just like Kitty's, gave the royal a delightful silhouette, with its off-the-shoulder plunging neckline and above-knee length. Reportedly, Diana had kept the dress in her wardrobe for years after buying it in 1991, and was said to have thought it too 'risqué' in hindsight.

I’m extremely proud of my cousin Prince William,” Kitty said of the Prince of Wales in a new interview Princess Diana’s nieces Lady Kitty Spencer, Lady Eliza Spencer and Lady Amelia Spencer supported their cousin,

While it is rare to see the Spencers and the rest of the royal family together in the public eye, Princess Diana's niece, Lady Kitty Spencer, had nothing but kind words for Prince William after supporting him at the October 16 Centrepoint Awards in London. She arrived at the event alongside her sisters, Lady Eliza Spencer and Lady Amelia Spencer.