Betty White
The Betty & Friends: My Life at the Zoo author has served on the board of the Greater Los Angeles Zoo Association since 1974.
Pink
When partnering with PETA, the singer made it clear that she would never wear fur. "Animals are the purest spirits in the world. They don't fake their feelings, and they are the most loyal creatures on Earth," she shared. "I wish everyone was forced to learn the horrors that these animals go through for fashion trends."
Taraji P. Henson
The Empire star is one of many stars who have participated in PETA's "I'd Rather Go Naked Than Wear Fur" campaign. "I don't think a living being should suffer for the sake of fashion, period," she proclaimed. "End of story.
Tracey Stewart
If you're wondering why Jon Stewart's wife has earned the title of "animal queen," we're happy to explain. The Do Unto Animals author cares for 32 animal "family members" and plans to open Farm Sanctuary's 4th location at her New Jersey farm in 2017 with Jon.
Beth Stern
The Oh My Dog author and Animal League spokesperson helps focus national attention on the plight of shelter animals. She also has been a "foster kitty mom" to hundreds.
Emily Deschanel
The Farm Sanctuary Board Member regularly lends her voice to the organization for PSAs, video and programs, and encourages people to make more compassionate choices for farm animals, the environment and their own well-being.
Kat Von D
Between her 100 percent cruelty-free and vegan makeup line titled Kat Von D Beauty and the decision to spend her birthday volunteering at Farm Sanctuary's Southern California Shelter, it's safe to call this artist an animal lover and activist.
Sarah Mclachlan
When not moving us to tears with her ASPCA commercials, the "Angels" singer is involved in many organizations that help take care of animals.
Paul McCartney
In a campaign for PETA, the rocker shared the moment he realized not eating meat is the best choice for him. "Many years ago, I was fishing and as I was reeling in the poor fish, I realized, ‘I am killing him—all for the passing pleasure it brings me,'" he shared. "And something inside me clicked. I realized, as I watched him fight for breath, that his life was as important to him as mine is to me."
Alicia Silverstone
The Kind Diet author was the first Hollywood star to bare all in PETA's first-ever naked veggie testimonial.
Kesha
When performing at the The Humane Society of the United States' annual gala, the "Tik Tok" singer voiced her support for the organization. "I want to dedicate this song to every man, woman, child [and] animal that has ever been abused," she shared before her performance.
Ian Somerhalder & Nikki Reed
Whether visiting the state capital for animal rights, posting pets who are up for adoption on Instagram or supporting various charities, this duo proves pets are one of their biggest passions.
Pamela Anderson
While the actress has always been outspoken about animal rights, Pamela recently shared an important message to California residents. "Making a splash for the environment doesn't just mean shorter showers," she shared. "Try vegan."
Bob Barker
No matter how many episodes of The Price Is Right you watched, you will remember the host's final words. "Always have your pets spayed and neutered."
Tom Hardy
The actor is so dedicated to animal rescue that he joined PETA to share the important message of animal adoption.
Prince William
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NEXT GALLERY: Stars Who Adopted Pets