21 Dramatic On-Screen Transformations You Won’t Believe

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Being an actor is all about transforming yourself into a different person. While most of the time, that just means mentally becoming that character and memorizing some lines, there are other times that require stars to go above and beyond — especially when it comes to their physical looks.

Vanessa Hudgens' most recent film — Gimme Shelter — required her to cut off all her hair and gain 15 pounds. And not to mention she had to wear baggy clothes, have a neck tattoo, and act as a homeless, pregnant teenager. This character is certainly a far cry from Gabriella Montez, don't you think?

This got us thinking about all the other dramatic transformations actors had to undergo in order to take on a big role. To see some of the most dramatic ones that are hard to believe, click through the gallery below.

Who do YOU think had to make the biggest change? Sound off in the comments!