Former Beatles member Sir Paul McCartney is the face of a new PETA campaign ad called "I am a vegetarian".
McCartney, who is 65-years-old, has been an active participant of PETA with his 40-year-old estranged wife Heather Mills.
"If anyone wants to save the planet, all they have to do is just stop eating meat," Usmagazine.com quoted McCartney as having said.
"That's the single most important thing you could do," he stated.
"It's staggering when you think about it," he said.
"Vegetarianism takes care of so many things in one shot: ecology, famine, cruelty," he added.
In his ad for PETA, McCartney sited a life changing experience of his.
"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 said.
"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."
"I am Paul McCartney, and I am a vegetarian," he added.
PETA (People for the Ethical Treatment of Animals) is also publishing the vegetarian testimonials of Pam Anderson, Forest Whitaker, Casey Affleck and Alicia Silverstone.
"Whether it's for animals, the environment or health reasons, stars' reasons for keeping animals off their plates are as diverse and inspiring as their talents," PETA managing director Ingrid Newkirk told Usmagazine.com.