Kristin Cavallari's Girl Fight on 'The Hills' (VIDEO)

At a noisy club, drama ensues among the clan of 'The Hills' (Tue., 10PM ET on MTV) -- as usual. Kristin Cavallari and friend-with-benefits Brody Jenner are lounging with friends Audrina Patridge and Lo Bosworth. Allie Lutz is there, and K-Cav has a bone to pick with her.

"You're a psychoass who broke into [Brody's] house in the middle of the night," Kristin says. "I've never broken into Brody's house!" responds Allie.

"I was in the bed, sweetheart," says Kristin. Allie is stunned silent. Awk-ward ... but entertaining for Audrina and Lo, who try to stifle big grins.