Is Miley Cyrus a Mean Girl?

If a semi-sexy Vanity Fair spread didn't change Miley Cyrus' image as a good girl, this just might! The star has posted a nasty video on YouTube mocking fellow teen queens Selena Gomez and Demi Lovato -- said to be Miley's rivals.

The "Hannah Montana" star and best friend Mandy tease Demi, 15, about a gap she used to have in her teeth, and then make fun of Selena's t-shirt.

Why the sudden catfight? Reports say Selena, 16, is dating Nick Jonas -- Miley's ex -- though Selena denied it to "Extra." "I'm not dating any of them," she said of The Jonas Brothers.

Demi and Selena are also being hailed as "Miley 2.0," but Miley told us, "I don't think there could be a next Miley."

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