|Christina Ricci and Robert Pattinson in "Bel Ami"|
The 31-year-old actress locks lips with the British star in their new movie 'Bel Ami' and she found him "lovely" to work with because of their shared sense of humor.
And she admits locking lips with Robert - who is dating his 'Twilight' co-star Kristen Stewart - isn't the hardest thing she's ever been asked to do.
She said: "Everyone keeps asking me how it is to kiss Robert. He's a good kisser. And I'm not being nice. It's just like that
"He's always the kind of guy that you can look at and go, 'Oh God, this is uncomfortable'. And he's really lovely to work with, especially in those kinds of scenes because he's so quick to laugh at himself - and me. He's very self-deprecating, as am I."
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Christina has stripped for several film roles - including 'Prozac Nation', 'AfterLife' and 'The Ice Storm' - and insists she has no problem with on-screen nudity, though she admits she doesn't know why she has had so many raunchy roles.
In an interview with Total Film magazine, she said: "I'm not really sure how that's all happened. It goes with the territory sometimes. It goes with what a certain character is going through, and what happens in the story.
"I think it's best not to have feelings about that kind of thing either way. If it's required for the part, it's required. If it's not, then I don't have to worry about being naked.
"I'm OK with it. I've learned to be OK with it. It takes a while to get used to, definitely, but you learn."