Vanessa Hudgens looked nothing like her usually beautiful self on the set of her new movie “Gimme Shelter” last week in New Jersey.

To get in character for her role, the 22-year-old actress underwent a massive transformation that saw her wearing short, unkempt hair, a shapeless grey hoodie over a black T-shirt, and baggy faded jeans and a pair of black sneakers. She also sported a tattoo on her neck, along with lip and nose piercings.

She posted to her Facebook page:

“Hey guys, what’s happenin? I have been so stupidly busy working on Gimme Shelter. I’m so excited and proud of the work I’ve been doing and let me tell you, you all are going to be SHOCKED with how I look in this movie. It’s crazy sauce. Lol only one more week of shooting till I’m done!”

In the film, which also stars Rosario Dawson, Hudgens plays a teenager who gets pregnant and put out on the streets by her Wall Street father (played by Brendan Fraser) to fend for herself after she decides to keep the baby and not have an abortion.

“Gimme Shelter” is due for release sometime in 2012.

Check out 10+ pics of Vanessa Hudgens rocking her “tomboy look” on the set of the flick below!