I’ve been dying to see the new movie ’21,’ which tells the story of some super-smart MIT math nerds who make big bucks counting cards in Las Vegas. I read the book it’s based on, “Bringing Down the House,” and the film stars one of my favorite new actors, Jim Sturgess, who was fantastic in “Across the Universe.” Now, Kate Bosworth, who co-stars in the film as Jim Sturgess’ love interest, reveals how they prepared to do a steamy love scene- they got hammered.

The 25-year-old actress cannot recall shooting her love scene with Jim Sturgess for 21, she told PEOPLE at Wednesday’s Cinema Society and Calvin Klein Jeans-sponsored screening of the film in Manhattan.

“We were both so drunk,” the Superman Returns star said. “Jim and I became such good friends, we decided to have a couple of drinks, loosen up and go for it.”

Sturgess – who plays the lead in the shot-on-location casino flick, based on Ben Mezrich’s book, Bringing Down the House: The Inside Story of Six MIT Students Who Took Vegas for Millions – has similarly fuzzy recollections.

“We were on Grey Goose, I think,” said the British actor. “It was brilliant for about half and an hour. As we continued to drink … it just became sloppy and messy. I couldn’t stand up at one point.”

[From People]

I always wondered how actors got through these loves scenes- now it makes perfect sense. From what I’ve read, shooting these kinds of scenes are no picnic- there you are, often buck naked with someone you barely know, while an entire film crew is standing around talking and telling you what to do. Then again, Jim Sturgess is adorable, and I know many women who’d happily brave all that discomfort for the chance to smooch him. If you haven’t seen him yet in “Across the Universe,” do yourself a favor and rent it.

Kate Bosworth is shown after having lunch with friends on 3/30/08, thanks to Splash News. I find her outfit kind of fascinating and can’t decide if I like it or not.