Sarah Ferguson led birthday tributes to her dear friend, Princess Diana , on what wouldve been the late royals 63rd birthday.

Diana was born on July 1, 1961, and was 36 when she died in a car accident in Paris on Aug. 31, 1997. Prince Harry was just 12 at the time of his mothers death, while Prince William was 15.

Happy birthday to my dear friend, Diana. You were a pillar of light and love, Ferguson, the former wife of Prince Andrew, wrote in an Instagram post on Monday.

And what a legacy you have left behind. I will forever remember our laughter and the kindred, kind spirit I found in you, she added. I am sure you are watching over us always. Rest in peace my friend.

Ferguson, also known as Fergie, included a photo of herself and Diana from September 1990 in the post.