"New Moon" star Christian Serratos strips down for a brand new PETA ad.

At 19, the actress -- who returns as Angela in "New Moon" (out Nov. 20) -- is the youngest ever to appear in the "Rather Go Naked Than Wear Fur" campaign.

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Serratos, who is a vegetarian, tells PETA, "I've always been opposed to slaughtering, eating and wearing carcass[es]."

Charlize Theron, Eva Mendes, Karina Smirnoff and Roselyn Sanchez have also starred in PETA's campaigns.