Credit: Frank Micelotta/Getty

Now that The Hills is over and done with, Kristin Cavallari and Lauren Conrad are letting bygones be bygones -- but they're not exactly BFFs, either.

Cavallari, 23, replaced Conrad, 24, as the protagonist and "narrator" of the series in 2009, but the pair have a rocky history: as schoolmates on Hills precursor Laguna Beach, they both battled over Stephen Colletti. And both bad girl Cavallari and the milder Conrad dated Brody Jenner.

"I saw her at the wrap party on Saturday and we caught up," Cavallari told at Tuesday's series finale party, explaining that they're now cordial -- but that's about it.

"We are not going to lunch together and I don’t have her phone number, but we are cool."

Cavallari is on chummier terms with fling-turned-friend Jenner. Jenner, 26, is now dating singer Avril Lavigne; Cavallari is seeing Miguel Medina, a cameraman from The Hills.

Have they double dated? "We haven't yet, but we would," she told Us. "Our friendship is the most important thing and I don't think that anything will ever get in the way of that."