Jennifer Aniston kicks Kimberly Stewart out of John Mayer's backstage area

I don't really like jumping on the Jennifer Aniston is so desperate/needy/pathetic/insecure' train. People seem to either love her or think she's an absolute wreck, and apparently I'm one of only 12 people that are in between. All that said, everyone has moments of irrationality... and Jen had a pretty public one the other night. While backstage at boyfriend John Mayer's Hard Rock Calling gig in London's Hyde Park, Aniston spied Kimberly Stewart hanging out. Kim's the daughter of Rod Stewart and is generally known for... um... hanging out.

According to the Mirror, Aniston ordered Kim banished from the backstage area - and Kim refused to listen.

John clearly has a bit of history with the model as all hell broke loose when clingy Jen spotted 28-year-old Kim backstage while John was warming up. Ever the gent, John tried to defuse the situation by getting his security to boot out Kim. And as the bouncers chased after Kim, Jen, 39, eyeballed her rival to warn her off John.

Our spy says: '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.'

But Kim wasn't giving up without a fight… 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.'

[From the Mirror]

Wow. I don't think anyone came out of that situation looking good. Aniston looks jealous and crazy, Stewart looks like a pathetic moron for sticking around until she was forced about by security, and Mayer looks whipped. Although frankly, that's not really the worst situation for him to be in, considering the way he seems to use and go through women.

The whole thing about Jen not wanted to be reminded' about what a player John used to be does cause a bit of worry. It makes it sound like she thinks she's tamed him. I don't think any woman should believe that about John Mayer. I swear to God if I'd been married to the guy for 60 years, I'd still be a little worried. Given his history, I understand Jen's paranoia.

Here's John Mayer performing live at ‘Hard Rock Calling' in Hyde Park, London on June 28th. Gotta love that performing face. Photographer: Daniela D'Amato. Header photo of Jennifer at LAX airport on June 21st; Photographer: Craig Williams. Kimberly Stewart at the Glamour Women Of The Year Awards in London on June 3rd; Photographer: Vince Maher. Images thanks to WENN.