Lauren Conrad Hooks Up With Audrina's Man?

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E! Online is reporting that 'The Hills' star Lauren Conrad may have done the unthinkable to one of her supposed BFFs.

Rumor has it that Lauren went behind Audrina Patridge's back and hooked up with her man.

On screen, Audrina and Justin Bobby dated, broke up, dated again, and repeated the annoying cycle continuously. Now it looks like over the weekend in Vegas, Lauren may have secretly had a little tryst with Justin.

If you must know, we don't even see what all the fuss over this guy is about since he's not exactly eye candy. We all know that what happens in Vegas stays there, but isn't there some kind of girl code that Lauren shouldn't have violated?