Hayden Panettiere
The mom of one has been a long-time animal activist and frequently speaks about the causes and rights of animals. In 2014, she even used some of her earnings to build a new home for a gorilla named Tony at the Kiev Zoo.
"Animals have always brought me joy in my darkest hours," she says. "Whenever I have gone through difficult times in my life, I have always turned to animals to find comfort, peace and happiness. They can be a small ray of sunshine in the darkest room. My hope is that Tony and his new habitat can bring a moment of comfort and joy to the people who visit him."
Jenna Dewan Tatum
Not only is the actress and mom an animal lover, but she walks the walk by following a strict vegan diet. Her famous husband, Channing Tatum, is not exactly on board with her food. Because he loves her, she says, he has tried going vegan, but the man loves a good burger and bacon.
Kristen Bell
In addition to her tireless activism and donations to animal rights organizations, Kristen Bell and her husband, Dax Shepard, adopted their dogs from an animal shelter and treat the pets like members of the family.
"I have treated all my dogs like my kids," she tells People. "To me, they're just kids I didn't birth."
Casey Affleck
After winning an Oscar, Casey Affleck used his fame and fortune for a pretty interesting cause: lending his voiceover talents to become the voice of a robotic bear for a new People for the Ethical Treatment of Animals (PETA) campaign.
Oliva Munn
The actress has taken a special interest in exposing the cruelties of animal fur farms. In Olivia Munn's view, fur is just not worth it.
Leonardo DiCaprio
Good ol' Leo established the Leonardo DiCaprio Foundation, which according to its website is "dedicated to the long-term health and well-being of all Earth's inhabitants." And yes, that does include animals. The foundation has given away more than $61 million in grant money and helped 65 organizations in projects such as marine and wildlife conservation.
Betty White
It should come as no surprise that Hollywood's leading Golden Girl also has a soft spot for animals. She reportedly even turned down a movie role because it was going to have a scene involving a puppy being tossed down a laundry chute.
Pamela Anderson
The former "Baywatch" star tells PETA that her journey to animal rights activism has been a long one, starting with being sexually abused as a child and turning that into empathy for all living creatures.
Doris Day
The world-renowned actress may have her passion for animal rights to thank for her longevity. The animal activist recently celebrated her 95th birthday at her home in California and used the occasion to ask for donations to her Doris Day Animal Foundation.
Liam Hemsworth
Liam Hemsworth was named PETA's sexiest male vegan in 2016. "Hot AND a friend to ALL animals!" the organization tweeted. Maybe that healthy diet is what helps him stay so zen with his fiance's Miley Cyrus' wild antics?
Beth Behrs
The "2 Broke Girls" star not only loves horses for the majestic creatures that they are, but she's also thankful for how much they have helped her in her own life. They help her with her anxiety, a realization that prompted her to start an equine clinic for sexual assault victims.
Alicia Silverstone
The "Clueless" star may be Hollywood's longest running animal activist. She's done everything from posing naked to bring awareness to the cruelty in making wool to raising awareness and funds for animal rights.
Simon Cowell
He's known for his blunt and sometimes cruel opinions, but the talent judge has a heart for animals. He actually works with PETA and has even rescued his two terrier dogs.
Katherine Heigl
Katherine Heigl is another celebrity with a foundation dedicated to helping animals. With the tagline, "We won't stop until the killing stops," the Jason Debus Heigl Foundation was formed after Heigl's brother, who also loved animals, passed away.
Bob Barker
Who would have guessed that Bob Barker is a lifelong vegetarian? The game show host has kept his wheel arm in shape through a strict vegetarian diet and even started his own nonprofit to help keep spay and neutering costs down.
