Miley Cyrus car unhappy quiet JOAN JETT Gym

Certainly a source of inspiration for Disney's sweet-tart!

Miley Cyrus has gone from kid-friendly singer to movie star bad girl during the past year or so, but we're more than happy to see her in a Joan Jett & the Blackhearts shirt while on her way into the gym Monday afternoon - Jett is a legendary Queen of Rock 'n' Roll and deserves to be one of Ms. Miley's idols.

Miley Cyrus car unhappy quiet JOAN JETT Gym

So why was the tempestuous 18-year-old in such an angry mood? Cyrus unleashed her fury on a photog after her mom Tish got bumped by his camera last week. The teen superstar screamed, "You just rammed my mom with your camera. Don't you ever do that again!"

And then the next day, Miley became enraged AGAIN when a pap got too close for comfort. Gotta pick your battles wisely, girl!

To find out about Miley's charity auction, click below the cut...