HOLLYWOOD, Calif. — Blake Lively is a far cry from vixen Serena van der Woodsen, the character she plays on Gossip Girl, except when it comes to fashion.

"I dress just like Serena! the 22-year-old actress admits in the November issue of Nylon. "I own half her wardrobe, so it's far too similar to the way I dress. I feel ridiculous at times with her – because I'm, you know, killing someone or marrying someone, but I look like me. I'm like, 'Oh, this is absurd.'"

Also absurd is the character she plays in her upcoming movie, The Private Lives of Pippa Lee.

"I had a leash around my neck, and Julianne Moore was taking pictures," Lively recalls. "I thought, What am I doing with my life? What is happening? How is this a good idea?"

When she isn't cuddling with her Gossip Girl co-star and real-life boyfriend Penn Badgley, Lively says you can always count on her to be pulling a prank on her friends.

Says Lively: "I [credit-card] swipe my friends with, like, my phone or something, - I slide it in their butts. Like in middle school! You say 'Visa! Mastercard!' Just to give somebody a jump. I'm a prankster."

Also see: Blake Lively Gallery