Jennifer Aniston Warns Kimberly Stewart Away From John Mayer

Fearful that her man John Mayer might stray, Jennifer Aniston ordered potential love rival Kimberly Stewart to vacate the backstage area of his Hyde Park, London concert at the weekend.

The Wonderland rocker was in U.K. to play at the Hard Rock Calling festival, and was watched by his adoring girlfriend who had flown in from America for groupie duties. However, the presence of Rod Stewart’s daughter caused the Friends actress some distress.

A spy tells the Daily Mirror: "Jennifer spotted Kimberly and asked John what she was doing there. John and Kim know each other from clubbing in LA, but Jennifer doesn't want anyone around who reminds her that he used to be a player.

"She has fallen head over heels for John, but she's scared it will all go wrong again. Another woman stole her man before when Angelina Jolie started dating Brad Pitt - she couldn't bear it to happen again."

However, the ever-stubborn Kim refused to go away. The source continues: "She had been told twice by security that she would be removed but she stood there bold as brass.

"Jennifer was on the opposite side of the stage and John felt like piggy-in-the-middle. He saw the tension and told his bouncers to get rid of her at all costs.

"Kim was pulled off the stage and escorted through the Hard Rock VIP tent with a face like thunder, shouting: 'Why doesn't he want me here? Is this because of her?'

"She totally embarrassed herself, but Jen looked relieved."