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Blake Lively, Leighton Meester

Marion Curtis/Startraksphoto.com

Did Blake Lively and Leighton Meester have to do much acting for their buzzed/blogged-about fight scene in an upcoming episode of Gossip Girl?

The two are rumored to be less than friendly in real life, so maybe their characters' on-camera catfight, complete with hair pulling, wasn't too much of a stretch.

"Blake was coming at me and I was scared," Leighton told E! News at the show's second-season premiere party held in the Hamptons.

But for Blake, the scene was more funny than frightening. "We were laughing so hard...it was 1a.m. and it was rainy out," she dished. "We were ad-libbing."

We so believe you on that one, B.