Sadly, the prospects for a Kristin Cavallari guest appearance on The Hills are slim to none. But at least we still get the occasional chance to see Lauren Conrad's high school rival from Laguna Beach... in skimpy outfits, to boot.

Here's Kristin Cavallari in a bikini and tank top (if you can call it that) on the set of her new movie, Green Flash, which may suck a lot, but you know what, it still stars Kristin Cavallari, so at least it's got some hotness going for it.

Kristin Cavallari photos: Not unattractive by any means.

As for whether you'll see Kristin Cavallari topless in this film, well, we wouldn't count on it. Chances are only a lucky Nick Zano will get to peep that.