Actresses often undergo drastic changes to physically morph into their movie characters. Some leading ladies like Michelle Williams have not only morphed their bodies but their off-screen style as well.
For Williams, her role as Marilyn Monroe in "My Week With Marilyn" has meant a full fashion transformation: from her Vogue spread to various red carpet outings, Michelle has sported retro looks and bleached blonde hair, channeling the Hollywood icon flawlessly.
Check out Michelle plus six other actresses -- Kate! Sienna! -- who have let their onscreen movie roles influence their offscreen fashion!