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Joanne Froggatt, Duchess of Cambridge, Kate Middleton

Kevork Djansezian/NBC/Samir Hussein/WireImage

What do you do when Kate Middleton, the Duchess of Cambridge, visits your show's set? If you're Joanne Froggatt, you accidentally make a raunchy comment. Froggatt, who has won a Golden Globe for playing Anna on Downton Abbey and been nominated for three Emmys, told Conan O'Brien about her accidentally dirty comment.

"You're just getting more and more nervous," Froggatt said on Conan about the constant updates on Middleton's visit. She and Michelle Dockery were the only ones filming that day. "We're doing this scene and she's very beautiful, lovely. She has this amazing aura when she walks in the room…before we actually said hello we had to act right in front of her."

Froggatt said she got a bit jittery having to act in front of Middleton. After the scene wrapped, the Duchess of Cambridge said she felt weird being in Lady Mary's (Dockery) bedroom. "I said, ‘Yeah, not many people get to come in Lady Mary's bedroom,'" she said. "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?'"

Yikes!

But Froggatt said Middletown let the comment drop too and was very gracious.

Downton Abbey airs Sundays, 9 p.m. on PBS.