One issue Paul McCartney and his estranged ex Heather Mills aren’t feuding over: animal rights.

McCartney, 65, is lending his face to PETA's new "I Am a Vegetarian" ad campaign – and Usmagazine.com has an exclusive first peek!

"If anyone wants to save the planet, all they have to do is just stop eating meat," McCartney tells Us. "That's the single most important thing you could do.

“It's staggering when you think about it,” he adds. “Vegetarianism takes care of so many things in one shot: ecology, famine, cruelty."

In his ad for PETA (an organization he endorsed with his ex, Mills, 40), McCartney declares:

"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.'

"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."

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 tells Us.


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