"Downtown Abbey" star Joanne Froggatt confessed that she accidentally made a racy comment in front of the Duchess of the Cambridge, Kate Middleton when she visited their set. The 35-year-old star admitted in Conan O' Brien's talk show on Wednesday that she spilled something raunchy.

"You're just getting more and more nervous," the actress said when they were constantly reminded of the 34-year-old royal's visit. That day, she and Michelle Dockery were the only ones who were filming, according to E! News.

"We're doing this scene and she's very beautiful, lovely," the wife of James Cannon explained. "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."

When the shoot was done, Froggatt got anxious to face the spouse of Prince William. Later, Middleton claimed that she felt uneasy being in the Lady Mary's bedroom.

"I said, 'Yeah, not many people get to come in Lady Mary's bedroom,'" the Golden Globe nominee commented. "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?'"

However, Froggatt and Middleton just let it slide and didn't take it seriously. Meanwhile, she also shared that she has to keep her color pale for her role signature role Anna Bates, InStyle reported.

The 52-year-old television host, on the other hand, said that he, too, could relate to her situation. "I don't have to be [pale], I just am. I'm completely bloodless," he jokingly said.

Froggatt just admitted that she has the same skin tone like O'Brien and she has to maintain it for acting like a poor servant of the 20th century in the English countryside. "It's in our contract because they wouldn't have traveled at that time," she added.