Kristin's Advice to McKaela Turns Heated on 'The Hills' (VIDEO)

Another night, another fight in a noisy, crowded venue. Must be 'The Hills' (Tue., 10PM ET on MTV). This time it's between McKaela, Allie and Kristin (as usual). McKaela was Brody's fling when he and Kristin were in their friends-with-benefits phase. Now she's being advised by Kristin to steer clear of Allie.

"McKaela, how innocent and sweet can you be, and you're friends with Allie Lutz?" says Kristin. "People may say I'm a bitch, but at least I'm honest and I'm not trying to be someone that I'm not."

Then she launches into a fight with Allie, who apparently was yelling at her "from across the [beep] way." When Allie says she doesn't want to ruin Kristin's night, K-Cav replies with her trademark smirk, "You're not ruining my night," and confidently walks away arm-in-arm with Brody.