Hills star Stephanie Pratt isn't sure if she will be good friends with co-star Kristin Cavallari

Hills star Stephanie Pratt has said she isn't sure if she will be good friends with co-star Kristin Cavallari.

Kristin, 22, is already known for having a lot of enemies, even though the new series of the MTV reality series hasn't even started.

The sister of Spencer Pratt, Stephanie, can't decide if she is going to be friends with Kristin.

Stephanie, 23, said: "I did sleep over. I'm trying. I think we'd have a lot of fun together."

Kristin is causing a lot of drama in The Hills as she tries in the new series of the show to get together with her co-star Audrina Patridge's on-off boyfriend Justin Bobby.

Stephanie doesn't trust Kristin for this and consequently isn't sure whether or not she will be good friends with her.

She added: "If she's going in the direction she's going, which is a non-Justin Bobby direction, it's great, because maybe Audrina can somehow work it out.

"But if she's going in that direction, that means she's possibly gonna be dating someone that I don't like, and that'll be hard."