AceShowbiz -

Is an outspoken vegetarian and animal-rights activist, Paul McCartney is lending his face to PETA's new "I Am a Vegetarian" ad campaign. In the ad he did for the animal-rights organization, the former Beatle could be seen wearing a t-shirt sporting the words "Eat No ..." and a picture of a cow.

He was quoted in the ad as saying, "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." The veteran singer went on declaring, "I am Paul McCartney, and I am a vegetarian."

McCartney, moreover, added that "If anyone wants to save the planet, all they have to do is just stop eating meat. That's the single most important thing you could do. It's staggering when you think about it. Vegetarianism takes care of so many things in one shot: ecology, famine, cruelty."

Paul's estranged wife Heather Mills is a vegetarian as well. She decided to take her vegetarianism a step further back in 2007 after learning about farming methods and the impact they have on the environment.

"I'm a vegan now, a healthy diet which saves animals, something very important to me as I detest cruelty," Mills said at that time. "Following a plant-based diet not only benefits your health massively but also makes a huge difference to the planet, to animals and to feeding the world. My hope is to continue to put the message out there."