Britney’s in the latest Star magazine duking it out with Demi Lovato.

“Tensions are at the boiling point,” says a show insider. “There is a bitter rivalry between them, and it’s already pretty much exploded, which is crazy considering how early into filming it is.”

“Demi thinks Britney is a twit, and Britney thinks Demi is beneath her,” says another source. “They avoid each other as much as possible when the cameras aren’t rolling”

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