Simon Cowell is becoming vegetarian for Leona Lewis.

The music mogul has been persuaded by the 'Bleeding Love' singer - who he mentored on UK TV talent show 'The X Factor' in 2006 - to support Sir Paul McCartney's Meat Free Mondays campaign, in which people give up eating animal products once a week.

Leona - who met the Beatles legend at the end of last year to discuss getting Simon involved - said: "Anything I ask Simon to get involved in regarding my charity and environmental concerns he always does. He's cool like that."

Simon - who recently got engaged to make-up artist Mezhgan Hussainy - joins other committed vegetarian stars Coldplay frontman Chris Martin, Kevin Spacey and Woody Harrelson in supporting Paul's cause.

Leona is a long-term vegetarian and has even banned meat from being served on her upcoming tour because she is so against the butchering of animals.

She said: "The meat industry is polluting the environment. I've banned meat from all photo shoots to the tour itself simply because I don't support the meat industry."