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"There wasn't a period in my life like Serena went through, where I was doing drugs and having sex with my best friend's boyfriend," Lively, 20, tells Cosmopolitan in its September issue. "I never went through that kind of crazy."
In fact, the actress is steadily dating costar Penn Badgley.
"I've kissed just three people in my life, other than stuff that I've done for TV or movies," she says. "I know – I'm weird!
"I hope Brad Pitt doesn't hear this," Lively says, teasing. "He's never going to want to marry me!"
While her character attends New York prep school and leads a champagne-fueled life, Lively tells the magazine her high school experience was far more down to earth.
"I was class president, on the cheerleading squad, in a competitive show choir, and in, like, six different clubs," she says.
"I don't drink. I don't do drugs," she says, deadpanning, "But I do sleep around a lot."
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
Note that this week’s cover of PEOPLE may differ regionally
