Glimpse of the most dramatic celebrity film transformations in Hollywood

The most dramatic celebrity film transformations: Christian Bale lost 62lbs for The Machinist, dropping to 121lbs before rapidly bulking back up in just six weeks on pizza and ice cream to become Batman - while Charlize Theron ditched her red carpet glamour to become serial killer Aileen Wuornos in Monster, later gaining 50lbs again for Tully to portray a struggling mother on the edge.