Alicia Silverstone made headlines Tuesday after she posed nude for PETA’s new campaign. The 46-year-old became a part of the campaign to show her support for animal rights and encourage people to wear vegan clothes.

“I never, ever, get naked in TV, in film, nothin’, never, nope — but I’ve done it for PETA because that’s how much it matters to me,” Silverstone, 46, said in PEOPLE’s first look at an exclusive video interview. “The amount of resources, water, food, oil for transport, the amount of energy that goes into making leather is extraordinary. It’s just not sustainable. The Earth can’t handle it,” she urged.

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PETA’s new “Prickly” ad features the actress in a desert, wearing nothing but cowboy boots in a cactus field. “DON’T BE A PRICK,” the ad reads. “Wear Vegan. Buy cactus, mushroom or apple leather instead!”

Who is Alicia Silverstone?

Alicia Silverstone was born in San Francisco, California. She is the daughter of Deirdre “Didi” Silverstone, a Scottish former Pan Am flight attendant and Monty Silverstone, an English real estate agent.

She grew up in Hillsborough, California. Silverstone started modeling when she was six. She attended Crocker Middle School, then San Mateo High School.

She made her film debut in the thriller The Crush (1993), earning the 1994 MTV Movie Award for Best Breakthrough Performance. At the age of 16 she became a teen idol after appearing in the music video for Aerosmith’s “Cryin’.” She went on to star as Cher Horowitz in the teen comedy film Clueless (1995). In 1997, she starred in Batman & Robin, playing Batgirl.

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Silverstone received a Golden Globe nomination for Best Actress – Television Series Musical or Comedy for her role in the short-lived NBC series Miss Match (2003). Silverstone has endorsed PETA activities and has published two cookbooks: The Kind Diet (2009) and The Kind Mama (2014).

She married to her longtime boyfriend, rock musician Christopher Jarecki at Lake Tahoe on June 11, 2005. The two dated for eight years prior to their marriage.