jennifer aniston and john mayerJohn Mayer has hinted that he might have a guest vocalist on his future musical offerings - girlfriend Jennifer Aniston.

John, who has been dating the former Friends star on and off for nearly a year, told OK magazine recently: “Do you know that girl can sing…?

“She does it when she doesn’t think anybody’s paying attention.

“I said to her the other night, ‘There’s a track in there.’ I think she could kill it.”