Courtesy of Magnum; Jill Johnson/jpistudios
Sharon Clott Kanter
Apr 02, 2011 @ 10:30 am

Rachel Bilson became a redhead! Well, temporarily at least. The actress donned a red wig on the set of her new Magnum commercial, which she filmed with Chanel designer Karl Lagerfeld, and you can see a sneak peek of the look in this new behind-the-scenes photo. Isn't it fun to play dress up once in a while? See more celebrities who love colorful hair in InStyle’s Rainbow of Star Hair Colors.

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