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Nicole Williams, PETA

Mike Ruiz, PETA

Nicole Williams is going topless for a very good cause.

E! News can exclusively reveal the WAGS star's gruesome new anti-leather PETA ad in which the brunette beauty bares all. Nicole shows part of her bare breast while covering her boobs with one arm. The E! star strikes a painful stare towards the camera as a man peels off a giant square of skin on her bloodied back.

"Leather is a rip-off. That leather jacket or upholstery was someone's skin," reads the ad. Ouch!

In an exclusive on-set video from the PETA shoot, which will be featured in Sunday's new episode of WAGS, Nicole says, "I'm a crazy animal lover. I've always known that if I could have the opportunity to help I would and I'm just so honored that I get that opportunity now."

"As a model, sometimes you get into a shoot and you're not told what you're wearing," the brunette beauty continues. "A stylist just brings out everything and you don't have much of a choice. So I just let them know if I get booked for a job, I'm not wearing leather and I'm not supporting fur. I bring my own shoes, and if there's anything specific that they need I can bring it."

Nicole admits she has worn leather in the past but stopped when she learned about the terrible treatment of animals in slaughter houses around the world.

"Like most people, you don't think about where this leather is coming from. I mean you know it's animal skin, but you don't think about what has that animal gone through for you to wear this jacket," she says. "Animals have feelings just like us, and if you're an animal lover you'll realize that."

Watch a brand-new WAGS this Sunday at 10 p.m. to see more behind-the-scenes footage from Nicole's new PETA ad!