They certainly make a cute couple (see photo below), but Kristin Cavallari insists she and Fantastic Four star Chris Evans aren't an item.

The New York Post reported that the two definitely "hooked up" last week at the opening of Cabana One at the Mayfair Hotel in Miami, Florida.

"I hear that too! No, we're just friends," the former Laguna Beach star said Wednesday at the opening of Peter Alexander's flagship L.A. store.

"I've known [Chris Evans] for awhile – just through mutual friends. I've known him for a few years, actually. We're good friends."

So what's Kristin Cavallari's ideal type?

"I look for a guy who can really make me laugh," the aspiring actress says. "You know, looks go away after awhile... so someone who can really make me laugh and who's secure with themselves. In L.A. it's hard to find. They're prettier than the girls! There are a few good guys, though, but I haven’t found one lately. Or ever."

Next up for Kristin Cavallari - who one of our staff writers refers to as the original Lauren Conrad: A guest role on CSI.

"I'm filming it this week and next week," she said "I’m really excited."