Good Girls Gone Bad

Miley Cyrus isn't the first pop star to show her naughty side – check out how Britney, Christina, Rihanna and more stars went from PG to R-rated

  • MILEY CYRUS photo | Miley Cyrus

Credit: Bob D'Amico/Disney; Albert Michael/Startraks

Updated: Wednesday May 12, 2010 | 06:00 AM EDT

MILEY CYRUS

The Disney star was two good girls rolled into one, thanks to her alter ego, Hannah Montana. And though she's been known to push boundaries (think, every camera phone photo ever leaked), she's now spreading her wings further – and baring her cleavage – in the video for "Can't Be Tamed."