It seems even actresses get nervous around members of the royal family!

During a recent interview on Conan, Downton Abbey star Joanne Froggatt — who plays unlucky lady’s maid Anna Bates on the hit show — recalled Kate Middleton‘s March 2015 visit to the set and revealed she made in embarrassing comment to the Duchess of Cambridge when they met!

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After Kate, 34, watched Joanne, 35, film a scene with her costar Michelle Dockery — who portrays Lady Mary Crawley on Downton — Prince William‘s wife admitted she thought it was funny to be standing in Lady Mary’s bedroom, a set she’d previously only seen on TV.

kate middleton joanne froggatt getty images

Joanne (left) and Kate (right) on the Downton set in March 2015. (Photo Credit: Getty Images)

“I said, ‘Yeah, not many people get to come in Lady Mary’s bedroom,'” Joanne told late night host Conan O’Brien of her response. “And then I was like, ‘Oh my God. What have I just said?’ I’ve just said something that could be taken really the wrong way… and I thought, ‘Do I say? Do I draw attention to it?'”

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Thankfully, Joanne said Kate let the awkward comment fly by and didn’t mention it!

Watch Joanne dish on the funny moment in the video below!