Carla Gugino has become an expert in seduction. "I just bought these fluorescent bras," says the actress, exposing a fuchsia strap. "You can go over to Little Italy and really get the flirting!"

Gugino, 32, best known as the spunky mom in the Spy Kids movies, is now taking on the ultimate sex symbol: In the new Broadway revival of Arthur Miller's After the Fall, she plays a naive, doomed sexpot based on Miller's ex-wife Marilyn Monroe. "I didn't want to imitate Monroe, I wanted to have her spirit," says Gugino, who appears in lingerie—and, briefly, nude. "She had a childlike quality mixed with a profound sexuality."

Gugino, too, was reared a free spirit. At 4, the Sarasota, Fla., native spent six months living with her divorced mother in a tepee. "We bathed in a river, made oatmeal on a propane stove. I had a very bohemian life." Teen modeling led to acting and a role as Michael J. Fox's feisty reporter girlfriend on Spin City in 1996. "We had a Tracy-Hepburn banter," recalls Gugino, who left the show when producers decided to focus on Fox's office pals. Last year she starred as a tough U.S. marshal on ABC's Karen Sisco. Offscreen Gugino saves her seductive side for her beau of eight years, screenwriter Sebastian Gutierrez (Gothika). But onscreen she's only getting started: Next she'll play a parole officer in the noir thriller Sin City. "I hold a gun," she says, "clad only in a G-string and shadows."

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