Sir Paul McCartney has launched a campaign to mark 10 years of his Meat Free Monday movement.
Fellow Beatle Ringo Starr, actor Tom Hanks and actress Rita Wilson are among the list of stars to have pledged support for Count Me In.
Sir Paul, who is vegetarian, launched Meat Free Monday, which encourages people to go without meat once a week, with his daughters Mary and Stella in 2009.
Since then the charity has worked in schools, universities, restaurants and businesses, made an appeal at the EU Parliament and published a cookbook.
Sir Paul, will turn 77 on Tuesday, said he was astounded the "simple idea" had impacted people's lives for a decade.
Other stars to have backed the move include Joanna Lumley, Paul Rudd, Isla Fisher, Alec Baldwin, Ellie Goulding, Alicia Silverstone, David Walliams, Orlando Bloom, Beth Ditto and Livia Firth.