• PETA
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    CHRISTIAN SERRATOS 

    Cause: Vegetarianism 

    How She Got Involved:  In November, "Twilight" star Christian Serratos got dark and deadly for PETA. The Dia de Los Muertos-themed pro-vegetarian ad was intended to honor animals who had been sacrificed for food. Serratos has been a vegetarian for much of her life and says that in addition to being an animal lover, it's made her feel brighter and lighter.