It was the much talked about season finale of The Hills last night — Lauren Conrad said goodbye to the cast while Kristin Cavallari said hello. We didn't get to see that much of Kristin, but if she's anything like her sassy Laguna Beach self, then I'm so tuning in next season. As a farewell to Lauren and a welcome ceremony for Kristin, I present The Hills style battle. Check out my slideshow of red carpet and street photos of the blond frenemies over the years, and when you're done, vote for who you think has the best style. Painless, right? Let the battle begin.