BLAKE LIVELY gets the cover of COSMO!

Gossip Girl star Blake Lively vests up for the September 2008 issue of Cosmopolitan. Here’s what the 20-year-old actress told the mag:

On being nothing like her on-scre­en persona Serena van der Woodsen: “I was class president, on the cheerleading squad, in a competitive show choir, and in, like, six different clubs.”

On what she sees in a boyfriend: “I don’t want to date someone just to date someone. I want to be with a guy who’s going to be better my quality of life, better me.”

On kissing and telling: “I’ve kissed just three people, other than stuff I’ve done for TV or movies. I know — I’m weird.” ­

On her steady relationship with costar Penn Badgley: “I hope Brad Pitt doesn’t hear this. He’s never going to want to marry me.”