Is Jennifer Aniston so insecure that she would go to such extremes as having D-Lister Kimberly Stewart physically removed from her boyfriends concert? The UK Daily Mirror says so. John Mayer and Kim used to be seen on the L.A. club circuit and since we now know what a ladies man the singer is, I’d say it’s safe to assume his relationship with KS was more than just friendly. He’s proved over and over again that he loves him some blondes.

Anyway, back to the night in question. Kimberly showed up backstage while John was warming up for Sunday’s Hard Rock Calling gig in London’s Hyde Park. John tried to stop the mess before it started by asking a bouncer to have KS removed, but the young Kim refused to leave. Later when Jennifer saw her still hanging around, the you-know-what hit the fan and Kim had to be physically removed, kicking and screaming the entire way.

Ten minutes after being told to leave, she was on the side of the stage, waving at John and cheekily catching Jennifer’s eye while she was taking photos of her fella. We hear: “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.”

Yikes. I sort of feel bad for Kim. She’s like the “ugly girl” in high school that all the guys will call for a late night booty call but would never actually date. Except instead of high school it’s L.A. and everyone from John Mayer to Tommy Lee has been hittin’ that but you never see pictures of her with anyone.