Drew Barrymore has told Jennifer Aniston to come to her senses and dump John Mayer, it's claimed.

Drew - who starred alongside Jen in He's Just Not That Into You - has reportedly told the former Friends star that she is better off without joker-boy John by her side.

A source tells the National Enquirer, "Drew told Jen she could do way better and she'd be a fool to settle for him."

But it could be that Drew has a vested interest in seeing her pal ditch John - they once fell out over music.

"The first time Jen introduced Drew to John, they clashed over their tastes in music," continues the source.

"Drew likes the edgy, indie rock, while John has more mainstream pop tastes. They bickered over music for so long that Jen had to step in and and change the subject."

See Jen and John from the beginning below