She may play scandalous (and sometimes-slutty) Serena van der Woodsen on Gossip Girl, but Blake Lively insists that her real life is rather boring and tame. "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," the 20-year-old tells Cosmopolitan magazine. "I never went through that kind of crazy." The actress, who is dating her co-star Penn Badgley, in fact seems almost saintly. "I've kissed just three people in my life, other than stuff that I've done for TV or movies," she reveals. "I know — I'm weird! I hope Brad Pitt doesn't hear this. He's never going to want to marry me!"