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Kristin Cavallari may have played a mean girl during her season on The Hills, but she seems fairly down-to-earth when she's off-set. The California blond, who wore an edgy spike-embellished dress by The Blonds to the premiere of Salt earlier this week, has just announced she will be creating a shoe to benefit the children's charity OneKid OneWorld.Cavallari told PeopleStyleWatch, "I'm designing a