Judging by the first official trailer, exclusive to People.com, for the new episodes of The Hills, there’s going to be plenty to talk about when the show returns to MTV on Sept. 29.

“She’s the girl that’s going to stab us all in the back and she doesn’t care,” Stephanie Pratt says about Kristin Cavallari’s anticipated return. “How can one person turn all our lives upside down?”

Go HERE to watch the preview!

Here’s how: Lauren Conrad’s Laguna Beach rival also dated Brody Jenner, so his Playboy Playmate girlfriend Jayde may need to watch out.

Although Audrina thinks she’s moved on from Justin Bobby, she may not be ready to see him with another girl. And guess what — Kristin also has her eye on Audrina’s ex, who she met at Spencer and Heidi’s wedding.

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