Potty-mouthed actress Selma Blair — who currently co-stars in A Guy Thing — has an announcement to make. "I've turned over a new leaf, boys and girls," she grins. "I no longer swear. I put an end to that. After A Guy Thing, I read in The National Enquirer that I made everyone [on the set] upset with my longshoreman behavior, and that really saddened me. So I haven't sworn since!"

Apparently, Blair got hyper on Kit Kat bars between scenes, then took to doing Mary Lou Retton-style gymnastics around the set! "The first couple of weeks, they can't understand why Selma's crazy," she recalls. "I can't eat sugar and they all can, and you can't hold that against me. So it was actually a rule: 'No sugar for Selma.'"

While the star of Legally Blonde and Cruel Intentions admits to her naughty hijinks at work, she denies tabloid rumors of romance with Matthew Perry, whom she met while guest-starring on Friends. "Matt Perry is not my boyfriend, never has been," Blair insists. "I'm very, very fond of him. I have a major crush on someone else, but it's not Matt Perry. We're friends. He was driving me to my tennis lesson, and we got into a little fender bender. It was nothing. We've never made out or went on a date.

"If [that rumor] is anywhere," the 30-year-old jokes, "my mom probably started it." So who's Blair's crush? "Oh, no," she demurs, refusing to name the lucky fellow. "That wouldn't freak him out or anything!"