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Country singer Carrie Underwood became a vegetarian after (Credit: Getty Images)

Country singer Carrie Underwood became a vegetarian after seeing her parents "castrate calves," according to Taste of Country magazine. Ultimately, Underwood became a vegan, due to being lactose-intolerant.

Celebrity vegetarians and vegans

These celebrities are well-known for having embraced a vegetarian or vegan lifestyle.

Beyonce

In June 2015, singer Beyonce appeared on
(Credit: Getty Images / Ilya S. Savenok)

In June 2015, singer Beyonce appeared on "Good Morning America" to announce she was leading a plant-based lifestyle, according to Us Weekly.

Ne-Yo

Ne-Yo said his 2013 New Year's resolution was
(Credit: Getty Images)

Ne-Yo said his 2013 New Year's resolution was to give up meat and dairy, according to PETA.

Lea Michele

Actress Lea Michele says she fluctuates between being
(Credit: AP)

Actress Lea Michele says she fluctuates between being a vegan and a vegetarian. "I really feel that you need to kind of listen to your body and what your body is telling you to eat. So I was a vegan for about two years," she once told Shape magazine.

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Alicia Silverstone

Growing up, actress and
(Credit: Getty Images / Jamie McCarthy)

Growing up, actress and "The Kind Diet" vegan cookbook author Alicia Silverstone "flirted with vegetarianism," according to Oprah.com, but it wasn't until she became an adult that she changed her diet from "steaks and doughnuts" to a healthier, vegan one.

Betty White

Former
(Credit: Getty Images)

Former "Golden Girl" Betty White is an animal activist and a vegan, according to ET Online.

Russell Simmons

Hip-hop mogul Russell Simmons sat down with
(Credit: Getty Images)

Hip-hop mogul Russell Simmons sat down with "Today's" Al Roker, during which he confessed how he became a vegan: "Well, it started with my yoga practice and, you know, the practice of non-harming, "ahimsa," so I became a vegan because [of] compassion [for] the animals." Simmons has been leading a vegan lifestyle for nearly 18 years, he said.

Jessica Chastain

(Credit: AP)

"I used to think about dieting, but I'm vegan now, so it's not really a problem," actress Jessica Chastain once said, according to Harper's Bazaar.

Brad Pitt

According to The Daily Mail, actor Brad Pitt
(Credit: Getty Images / Jamie McCarthy)

According to The Daily Mail, actor Brad Pitt "has been a vegetarian for decades."

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Carrie Underwood

Country singer Carrie Underwood became a vegetarian after
(Credit: Getty Images)

Country singer Carrie Underwood became a vegetarian after seeing her parents "castrate calves," according to Taste of Country magazine. Ultimately, Underwood became a vegan, due to being lactose-intolerant.

Natalie Portman

Actress Natalie Portman is a vegan, but she
(Credit: AP / Joel Ryan)

Actress Natalie Portman is a vegan, but she went back to vegetarianism when she became pregnant, according to ABC News.

Sir Paul McCartney

This former member of The Beatles is a
(Credit: Getty Images)

This former member of The Beatles is a longtime vegetarian. In 2014 Sir Paul McCartney appeared in a promotional video asking for the public's support in Meat-Free Mondays.

Olivia Wilde

Actress Olivia Wilde is a longtime vegetarian, who
(Credit: Getty Images / Emma McIntyre)

Actress Olivia Wilde is a longtime vegetarian, who is now vegan. "[Being vegan] is not always easy and accessible, but it's a way of life and makes me as a person feel really good and physically look better. My skin was better, energy was better," she told The Huffington Post.

Ellen DeGeneres

Animal rights activist and comedian Ellen DeGeneres was
(Credit: Getty Images / Kevork Djansezian)

Animal rights activist and comedian Ellen DeGeneres was named PETA's Woman of the Year in 2009, according to the group's site.

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Anthony Kiedis

Anthony Kiedis of Red Hot Chili Peppers was
(Credit: Getty Images)

Anthony Kiedis of Red Hot Chili Peppers was 2008's World's Sexiest Vegetarian Celebrity, according to PETA.

Kristen Bell

Actress Kristen Bell was on a vegan diet
(Credit: AFP, Getty Images / Valerie Macon)

Actress Kristen Bell was on a vegan diet for less than two years before becoming a vegetarian again when she was pregnant with daughter Lincoln, according to WebMD.

Tobey Maguire

Actor and producer Tobey Maguire was a longtime
(Credit: Getty Images)

Actor and producer Tobey Maguire was a longtime vegetarian until he became vegan in 2009, reports Shape magazine.

Pamela Anderson

Actress Pamela Anderson has collaborated with PETA on
(Credit: Getty Images )

Actress Pamela Anderson has collaborated with PETA on various campaigns, including the "I'd Rather Go Naked Than Wear Fur" and "Turn Over a New Leaf -- Try Vegetarian" campaign, says vegan.com.

Mike Tyson

Former heavyweight boxing champion Mike Tyson says he
(Credit: AP)

Former heavyweight boxing champion Mike Tyson says he became a vegan to improve his health. "I was so congested from all the drugs and bad cocaine, I could hardly breathe, [I had] high blood pressure, [was] almost dying [and had] arthritis. And once I became a vegan, all that stuff diminished," he said on an episode of "Oprah: Where Are They Now?," via ABC News.

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Russell Brand

PETA dubbed English comedian Russell Brand
(Credit: AP)

PETA dubbed English comedian Russell Brand "Sexiest Vegetarian Celebrity" in 2011.

Former President Bill Clinton

Former President Bill Clinton embraced a plant-based diet
(Credit: Getty Images)

Former President Bill Clinton embraced a plant-based diet and became a vegan to improve his health, according to AARP.

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