The Queen's son founded Pitch@Palace, an organisation that aligns entrepreneurs with individuals who can "turn their business dreams into a reality."
He was visiting China where he met a group of the young up-and-comers.
"So proud of @hrhthedukeofyork and the Pitch team in China. Congratulations to all of the entrepreneurs who took part," she wrote as heart-warming Twitter post.
The former couple are famously best friends, and even housemates at the Royal Lodge in Windsor!
"We're a family unit and we lead by example," Fergie told HELLO!
"We support each other emotionally and we support each other health wise. At least every two weeks we sit down and communicate, the four of us." She continued: "I think the one thing I've done incredibly well – although I say it myself – is that I'm a really good mum. And I think my girls shows that."