Anne Hathaway in London, UK. Credit: Tony Clark/Splash News

Hair today, gone tomorrow!

Anne Hathaway is hard at work filming the big screen adaptation of Les Miserables in London and in the wee hours of Sunday morning, the actress showed off just how much she's gotten into character.

Leaving The Box nightclub with fiance Adam Shulman by her side, Hathaway, 29, debuted a close-cropped 'do -- a stark contrast to her usual long, flowing brown locks.

PHOTOS: More pics of Anne's new 'do

In the upcoming flick, Hathaway portrays Fantine, a prostitute stricken with a terminal case of tuberculosis who is forced to sell her hair in order to provide for her daughter, Cosette.

Lopping off her locks isn't the only way Hathaway is prepping for her Les Mis role. She's also drastically cut calories in an effort to slim down.

Tell Us: What do you think of Anne's new short 'do?