When chatting about the theatre, one of the kids accidentally let slip the F-bomb.
"When you’re on the stage, you can’t be like, you know, f—— around on the stage," he said to the shocked royals.
Meghan raised her eyebrows and started giggling, while a visibly shocked Harry took a step back.
The pair are in Bristol for a series of royal engagements. A heavily pregnant Meghan stepped out with her hubby Harry to meet with the thrilled locals.