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Michelle Williams As Marilyn Monroe & Other Off-Screen Style Lookalikes (PHOTOS)

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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!

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