Over the weekend Mischa Barton and Pixie Geldof hung out with some pals in a Camden park. The O.C. veteran, who I'm so excited to see back on the small screen in her new sitcom A Beautiful Life (out this Autumn in the States) has recently dyed her blonde hair a rich shade of chestnut brown. I happen to like her darker, as I think it brings out her blue eyes, but it's hard to picture her without her signature (extended) blonde hair that also works really well. Which hair colour do you like the most on Mischa?

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