They say blondes have more fun, but brunettes probably have way less hair damage. Olivia Wilde knows what we mean -- the actress showed up to the premiere of "The Five-Year Engagement" this week with a head of honey colored hair. Just days before, her locks were chestnut. What do you think of Olivia's trip to the light side?

It's de rigeur that celebs change up their hair color on a shockingly frequent basis. Remember: beauty is pain, and pain is a bottle of peroxide. As such, famous ladies like Kelis, Kate Beckinsale, and Kim Kardashian have been known to take their color up a notch, in the aim of going for a sunny California look. But does it work, or should they have kept their dark locks in the shade? You decide.