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Posted Thu, February 17, 2011 5:19pm EDT

When Good Stars Go Bad: Zac Efron, Justin Bieber & More Take On Shocking, Racy New Roles!

Which celeb’s transformation surprised YOU the most? Click through our gallery & vote!

Actors love to challenge themselves by taking on racy, controversial roles… and we love watching them do it! Some of our favorite celebs — from Zac Efron and Justin Bieber to Jennifer Aniston and Blake Lively — have recently ditched their safe images by playing shocking new characters, and we want to know which one was YOUR favorite!

Zac Efron will shed his High School Musical image in his next movie, The Necessary Death of Charlie Countryman, which will find him taking ecstasy, visiting a strip club and getting shot!

Blake Lively won’t be wearing those Traveling Pants again anytime soon. In fact, her latest movie roles haven’t called for any pants at all! After playing a slutty drug addict in The Town, her next big role will find her stepping into the shoes of a meth-addicted single mom.

Michelle Trachtenberg was first introduced as Buffy the Vampire Slayer‘s sweet younger sister Dawn, but for her upcoming movie Take Me Home Tonight, she admits to doing “a little research” to get in touch her role as a stoner.

Justin Bieber may be a Born-Again Christian in real life, but he transformed into a bat-ass bomber for two episodes of CSI this season.

Jennifer Aniston usually plays everyone’s favorite girl next door, but in her upcoming movie Wanderlust, she takes her top off, smokes pot AND has threesomes! Oh, Rachel…

Miley Cyrus has officially left Hanna Montana behind her! She’ll be barely recognizable in her next movie, LOL, in which she plays a binge-drinking wild child.