By InTouch Weekly
Some of our favorite movie stars go to great lengths in order to portray
their roles perfectly — and these seven physical transformations are the most
dramatic we've ever seen!
Left: 'Iron Man 3' Premiere, Right: 'Tropic Thunder'
Left: 'Chopper,' Right: 'Troy'
Left: 'Prometheus' Premiere, Right: 'Monster'
Left: Venice Film Festival for 'Mysterious Skin,' Right: 'Don Jon'
Left: 'Chapter 27,' Right: 'Dallas Buyer's Club'
Left: Screening of 'The Black Dahlia,' Right: 'Boys Don't Cry'
Left: 'The Machinist,' Right: 'American Hustle'