Two celebs, two red carpet looks, one event...who wins the fashion face off? Both Hayden Panettiere and her new Heroes' co-star, Kristen Bell, looked lovely at the Saks 5th Avenue Cocktail Party in Hollywood. But, they are dressed so differently it looks like they could be attending different events.

Hayden took the more formal route and displayed a sophisticated style with a splash of red...and we all know I can't resist a good red purse or clutch! Kristen went casual and showed off her great legs in shorts and high heels. Which look do you like best?

Click on thumbnails to enlarge.

And just for fun, here are a few candids of Hayden out at Koi (and is that her mom with her, wearing almost the same outfit Hayden wore to the cocktail party?!?)