We love Hayden Panettiere, and a big part of our infatuation is due to that hot, sexy ... brain of hers! She knows it, too. Here our girl Hayden is sporting a shirt proclaiming "This Girl's a Genius" as she exits the hot Koi restaurant in L.A. with mother and manager Lesley Panettiere. Anything but coy, if you ask us!

Hayden Panettiere: Beauty and brains! Sign us up!

She might be a girl genius who's on the market, as well. If you believe her co-star Kristen Bell, at least - Bell burst the Halo (Hayden Panettiere, Milo Ventimiglina) bubble at The Alliance for Children's Rights benefit in Beverly Hills.

"[Hayden and Milo Ventimiglia] are great friends. They're not dating," she said.

Well, that officially settles that. Okay, not really. This could be just a conspiracy... one that is being very well covered up. Go Halo!