'Fab four' make first appearance together, Princes William and Harry joke about working with family

Prince William, Kate Middleton, Prince Harry and Meghan Markle have made their first official appearance as the "fab four".

Appearing in a panel on stage at the inaugural Royal Foundation Forum in London, the Princes were candid as they talked about what it's like working together on charity projects.

The talk was chaired by BBC presenter Tina Daheley, who asked what it's like working with family and if they have any disagreements.

Without missing a beat Prince William laughed and said: "Ohhh yes!"

His comments left the room erupting in laughter, with Prince Harry also jumping in.

"Healthy disagreements," he added, making Meghan laugh suggesting it might have been an inside joke.

When asked what their last disagreement might have been over and how they resolved it, Prince Harry joked: "I can't remember, they come so thick and fast...but is it resolved?" he asked William as the crowd laughed.

"We don't know," William answered.

Getting serious for a moment, Prince Harry said: "I think it's good we've got four different personalities and we've all got that same passion to want to make a difference but different opinions and I think those different opinions work really, really well.

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The Duchess of Cambridge appeared to avoid the question, talking instead about the various partners that collaborated on Heads Together but Meghan wasn't afraid to dive in and add her voice.

WATCH: Prince Harry and Meghan Markle's first visit to Scotland. (Post continues.) 

"Thank goodness it's such differing personalities and that everyone is very communicative because that's how you can really see bigger change," the American actress said.

"If you all think the same, how are you going to push the envelope, how are you going to breakthrough in a different sort of mindset."

Meghan remained coy on what her big plans are only saying she was excited to be collaborating with her new family on projects she will announce in a few months time.