Sarah Ferguson is honoring her dear friend, Princess Diana, on what would've been her 63rd birthday.
The Duchess of York, 64, honored the late princess with an emotional tribute on Instagram, complete with a throwback photo. In it, both Fergie and Princess Di are dressed to the nines as they watch the Battle of Britain Anniversary Parade from the balcony of Buckingham Palace in 1990. The duchess captioned the post, "Happy birthday to my dear friend, Diana. You were a pillar of light and love. And what a legacy you have left behind. I will forever remember our laughter and the kindred, kind spirit I found in you. I'm sure you're watching over us always. Rest in peace my friend."