jennifer anistonJennifer Aniston was reportedly livid to spot Kimberly Stewart circling John Mayer in the backstage area at the weekend’s Hard Rock Calling event - and so had her thrown out by security. Twice.

An onlooker told the Mirror that the former Friends star first spotted the socialite model when John was warming up backstage: “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.”

Kimberly was then told to leave the backstage area by security - only to reappear at the side of the stage when John started performing.

The onlooker explained: “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.”