Bikini Photo Finish: Kristin Cavallari vs. Hayden Panettiere

Hayden Panettiere and Kristin Cavallari have some things in common.

They're among the more attractive celebrites we talk about, for one, and far too young for some readers to start thinking about in that way without feeling dirty.

Also, Stephen Colletti has gone there. Both times.

What we're here to talk about today, however, is their respective looks while wearing bikinis. After all, Hayden Panettiere is a self-proclaimed bikini girl!

People spotted Hayden in an adorable striped bikini recently, and she's been hitting the beach in Malibu on lunch break from filming her hit show Heroes in a gold-trimmed number (right).

Which bikini-clad cutie is your favorite?

Meanwhile, former Laguna Beach star Kristin Cavallari, soaking up the sun - thanks to that revealing suit, wow - enjoys a visit to Malibu's Polaroid Beach House with beau Nick Zano.

Kristin, who dated Stephen Colletti (boyfriend of Hayden Panettiere) while in high school, recently moved in with Nick Zano, her boyfriend of about a year.

So it doesn't look like there's any bad blood between the two. In fact, Kristin and Hayden were all smiles when they ran into each other shopping fairly recently!

Kristin Cavallari and Lauren Conrad, though? That's another story.