The former model - who last week invested in a seaside cafe which she plans to turn into a vegetarian eaterie - has agreed to launch a new meat-free burger at the company's 11,350 outlets throughout the world, according to U.K. newspaper The People.
A source tells the publication, "Heather is ecstatic. She believes she can change the eating habits of millions. She's also being paid a lot of money and the deal will help boost her standing."
Mills was reportedly chosen for the role after she gave $1 million worth of free veggie burgers to poor kids in New York last year.
(c) 2009 WORLD ENTERTAINMENT NEWS NETWORK LTD. All global rights reserved. No unauthorized copying or re-distributing permitted.