Gina Gershon, who is currently starring in "Bye Bye Birdie," tells us Broadway ain't for sissies! It's some of the hardest acting work in the biz.

"It's going. I'm tired. I went straight from filming for the Lifetime Movie Network to 'Bye Bye Birdie,'" says Gershon of how things are going with the musical. "Broadway really takes it out of you. I don't know how the actors who do Broadway all the time do it. You need a lot of stamina. I'm just in it 'til January so it's not too long."

In fact, after having already starred on Broadway twice -- once in the revival of "Cabaret" and then in "Boeing-Boeing" -- Gershon admits she hadn't planned on coming back to the stage anytime soon. "I did a play last year that was really physical as well and after that show, I was so exhausted that I was like, 'I can't do another play for a couple of years,' but then I got this opportunity. Luckily, it's very rewarding."

One other perk is that all of the dancing is keeping Gershon looking lovelier than ever.

"I gained a little bit of weight for 'Everything She Ever Wanted,'" she says, referring to her recent Lifetime project, "but now, I'm on the Broadway diet where you dance all the time, so you can eat whatever you want and you still lose weight. I think I'm two sizes smaller than I was in that movie without even trying. I like that part of it, for sure," she adds with a laugh.

Emily-Fortune Feimster