KATE BOSWORTH and her co-star JIM STURGESS ('Across the Universe') turned out for a special screening in New York of their new card-counting pic, '21.'

"I wish I knew how to count cards and I could teach all my friends but it's really not that easy," Jim joked, going on to point out: "The craziest thing I've ever done for money would be acting -- a pretty crazy thing to do for your money."

Kate, wearing CALVIN KLEIN and jewels by VAN CLEEF AND ARPELS, told ET of the shoot, which spent six weeks in Boston and then moved on to her hometown of Boston, "It was great just to have people your own age just to have fun with."

Oscar winner TATUM O'NEAL also stepped out for the premiere, and she commented with sympathy on ROBIN WILLIAMS' divorce news: "It's hard to stay married in our business."

'21' tells the story of a group of MIT brainiacs who join a card-counting scheme and make millions at Las Vegas casinos. The film, inspired by a true story, opens this Friday, March 28.