Kate del Castillo is saying no to fur by going completely naked in a social media post. The Mexican actress, who was linked to Milk star Sean Penn, has joined forces with People for the Ethical Treatment of Animals for a campaign.

The Mexican beauty posed in an icy snowscape wearing nothing but frost on her bare skin and covered up her nether regions with her hands for the snap. The tagline of the stunning image, which had a winter theme – compete with snow falling from the sky and blue makeup – reads, "I'd rather go naked than wear fur."

A post shared by Kate del Castillo (@katedelcastillo) on

The 45-year-old actress shared the photo on her official Instagram page and wrote, "There's nothing more beautiful than your own skin! This winter, let animals keep theirs & instead go #FurFree."

In a behind-the-scenes video shared by Peta, the Under the Same Moon star opened up about why she doesn't wear fur. She said, "I love the campaign and I think its a very powerful campaign. We need power right now. There is still killing animals for fur. There is a lot of work to do."

She explained that being beautiful has nothing to do with clothing and that beauty comes from within. She admitted, "I think when you see yourself in the mirror and there's no regrets ... that makes you a beautiful person ...."

"You don't need to wear fur to be beautiful," she insisted.

Recently, Castillo was in the news after she revealed that she had sex with Sean Penn after they secretly met with international drug lord Joaquin 'El Chapo' Guzman in Mexico in 2015. In the Netflix documentary, The Day I Met El Chapo: The Kate del Castillo Story, she describes how the Hollywood star seduced her.

"I enjoyed it and don't regret it I fell my friend, what can I say?" she bluntly claimed in the documentary.

During her appearance on a talk show, Good Morning America to promote the documentary she said, "I never fell for him, we had sex. Sorry, but we are both adults, single, and something was going on but that was it, it was business."

The film depicts the pair wining and dining as the Fast Times at Ridgemont High actor seduces her
"He said, 'That moment when you touched my chest, I knew something would happen between us,'" del Castillo recalls Penn telling her in the documentary. The actress added that when they got back from the meeting, "We were very moved so [it] made sense that something would happen."

However, Penn has vehemently denied all such claims and released a statement to People. The statement reads, "This is nothing but a cheap, National Enquirer-esque tale spun by a delusional person whose hunger for fame is both tawdry and transparent."

"It is reprehensible that, in their ongoing, relentless efforts to gain additional attention and publicity, Ms del Castillo and her team who have zero firsthand knowledge have sought to create this profoundly false, foolish and reckless narrative."