Prince Andrew, Princess Eugenie's father and Queen Elizabeth's son, played a huge part in the Royal Wedding.
Not only did the royal arrange for the event to be aired on TV, he also walked his beautiful daughter down the aisle.
“It’s a very small role, I just have to walk slowly!” the Duke of York said in an interview ahead of the nuptials, adding that he was sure his daughter would make “an absolutely outstanding bride.”
“Happy birthday to @SarahTheDuchess,” the royal wrote on Monday alongside a photo of Fergie smiling while wearing a blue dress.
“Wishing you a very happy day!” he added.
Fergie and Andrew's united appearance at Eugenie's wedding prompted many royal fans to believe the couple had reunited their relationship.
The couple first wed on July 23, 1986. They welcomed their daughters Princess Beatrice in 1988 and 1990.
Despite their growing family, there was trouble for the couple, and they announced their separation in March 1992, before officially divorcing four years later.
Fergie and Andrew have remained amicable since their divorce, with the Duchess even living in Andrew's royal residence, Royal Lodge, in Windsor.
“I’m in and out all the time, and he’s in and out all the time,” she explained in a 2016 interview for an Australian radio show. “And no, we’re not married. We’re very happy with the way things are.”
The Duchess of York continued, “I think the great thing is we absolutely are the most extraordinary example of a unified family.”