Are Miley And Taylor Mean Girls?

Prim and proper Miley Cyrus and Taylor Swift looked like butter wouldn’t melt in their mouths as they sang together at the Grammys.

But backstage, the teen queens made a gruesome twosome, insiders say, laughing and poking fun at their fellow performers, including their ex-boyfriends, Nick and Joe Jonas!

“Miley and Taylor spent most of the night ragging on the Jonas Brothers,” says a source. “These two are merciless when they get together. They were talking smack about Katy Perry’s outfit and how boring Zac Efron and Vanessa Hudgens were.”

Even pals Demi Lovato and Selena Gomez can’t escape their teasing. “Miley and Taylor seem sweet, but they can act like snotty little brats.”