Kristen Bell is in a lot of pain these days.

“I’ve started dance rehearsals and my neck is sore and my inner thighs are so sore,” Bell told me at last night’s Vanity Fair-hosted launch of Guess?’s new T-shirt benefiting Invisible Children.

No, the actress is not training for a stint on Dancing With the Stars. She’s getting ready to start shooting Burlesque, director Steve Antin’s upcoming drama in which she and Christina Aguilera costar as rivals at a Hollywood burlesque club owned by a former dancer played by Cher.

Rounding out the cast is Twilight stud Cam Gigandet, Julianne Hough and Stanley Tucci.

So just how much skin will Bell and the other young starlets be flashing in the film? Sounds like a lot, but…

“My character is fun and sexy but not a stripper,” Bell said. “There is no nudity, and there are no pasties and G-strings.”

Her costumes include Madonna-esque cone bras and “Marilyn Monroe boy shorts—the high-waisted panties kind of thing,” Bell explained.

“It’s very artistic burlesque,” she said. “Burlesque is a tease. It’s not meant to really give that much away because that wouldn’t be considered a tease. It would be considered giving away the goods.”

Dancing aside, Bell may end up—gulp!—singing with Xtina. It’s not something the former Veronica Mars star is looking forward to.

“There’s a competition between the two of us,” she said. “I really want to sing and she’s allowed to sing at the club so we fight…In the end when all is well, they may sing together. I almost wish they wouldn’t, because I would rather just listen to Christina.”

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