Kristin Cavallari loves being the bad girl on The Hills. Kristin will debut on this season’s Hills (airing September 29th) and word has it that she shakes things up quite a bit. There’s some sort of rumored feud between her and Audrina that seems to be as real as the spat between Lauren Conrad and Heidi.

more Kristin after the hop…

MTV aired a series of “The Bitch Is Back” advertisements for the newest season of The Hills, alluding to Kristin. She told MTV:

“The bitch is back”? “I think it’s funny,” she laughed. “Honestly, I think it’s fun to play the bad girl, and no one remembers the nice girl, you know?”

Meanwhile, Audrina refers to her as a man-stealer.

“Lauren basically told us she’s a man-eater. She’s a boyfriend stealer,” Audrina said. “These are people’s lives that she’s messing with. People do have hearts and feelings.”

Can’t wait for the new season! MTV was smart to bring her back on.

Photos: Fame