Hills Drama At The VMAs - Audrina Cancels Because Of Kristin!

But is this the truth or just another publicity stunt? Either way, it's working!

Audrina Patridge has apparently pulled out of presenting at the Video Music Awards today because, you guessed it, she found out she'd be doing it with co-star Kristin Cavallari, reports In Touch Weekly...

Says a source: "Audrina hates Kristin, and MTV sprung this on her last minute so she decided to cancel. She doesn't even want to be in the same room with Kristin."

You gotta love these cat fights! A friend of Cavallari's claims Kristin is "happy." They also say that "Kristin is the star of The Hills, not Audrina."

Dude, Kristin hasn't even been on yet! Lame. Think these two are really squabbling? Mean girls alert!