Fans were quick to flock to Fergie's post.
"Cut to the chase and get remarried already," one wrote.
Another added, "Oh how I would truly love to see you two back together. I's nice to see you both so supportive of each other."
"I think you still belong together," a third echoed.
The royals initiative Pitch@Palace "gives Entrepreneurs the opportunity to meet the people who can help make their business dreams become a reality," and it's the second time its been brought Down Under.
The program also supports Entrepreneurs by providing them with the best opportunities to access mentors and advisers, distribution systems and supply chains, connections and investment and Prince Andrew is at its helm.
Pitch@Palace's official webpage says there is a global component which helps "build access and connectivity around the world.
Watch Fergie speak about Andrew below: