Simon Phillip Cowell (born October 7, 1959) is an English artist-and-repertoire ("A&R") executive and television personality/producer, best known as a judge on such TV shows as Pop Idol, American Idol, The X Factor, and Britain's Got Talent. He is also the owner of the television production and music publishing house Syco.

from hellomagazine.com, undated profile:

His indulgences are houses and cars, of which he owns several, and the hard-working vegetarian takes just one holiday a year

from celebrilla.com, undated:

Simon Cowell maintains his rugged good lucks through a vegetarian diet

but.... if this is correct it must be quite recent:

• animalaid.org.uk - 2002 interview, Tries being Vegetarian for a week, concludes he won't become one
• guardian.co.uk - 2005 interview, lists lots of meat he likes

There are many online references to Cowell being vegetarian, but apparently no recent direct interviews on the subject. He does some animal welfare work for PETA: anti-fur campaign ; dogs in cars.