Taking to Instagram, the ex-wife of Prince Andrew shared a photo from the event to her throngs of fans on social media.
"Such an honour to be @ccbutterflyball for @cauldwellchildren with @johncaudwell."
The royal has been setting tongues wagging recently as it looks like she and the Duke of York are planning on rekindling their romance with an upcoming royal wedding.
Since the royal wedding of Prince Harry and Meghan Markle in May last year, the Duke of York and his flamed haired Duchess Fergie have gradually stepped back into the spotlight together, and sources tell New Idea the long-term lovers are "pulling out all the stops to make things official" before Fergie's 60th birthday on October 15.
The Duchess of York has been by her ex-husband's side at a litany of major royal family events of late.
Andrew and Fergie sat together to watch their youngest daughter Princess Eugenie marry her longtime love Jack Brooksbank at St George's Chapel in Windsor last October, and even jetted off to Bahrain together for a family holiday with Eugenie and Princess Beatrice at the beginning of the year.
We can't wait for these two to make it official!