It seems Gossip Girl stars Blake Lively and Leighton Meester are as bitchy off screen as they are on the show.

Chace Crawford - who plays Nate in the show - revealed that things can get a bit tense between his female co-stars.

"There are obviously always little dramas. You are on set for 16 hours, so people get irritable. In any workplace there are always little things and frustrations,” the actor admits.

"Leighton and Blake could not be more different from each other but as far as I know there has never been any real difficulty. We are all good friends and we go out socially together."

Haven’t the girls learnt by now that it’s wrong to gossip?