Who's that girl?!

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Rose McGowan is barely recognizable in the new trailer for "Conan the Barbarian" -- where she loses her eyebrows and a few inches off her hairline ... and even manages to get her light skin even lighter!

The actress recently told WWD that the makeup process to become witch Marique took six hours to complete -- starting at 6:30am.

Watch the trailer below -- and see more movie transformations in the gallery above!

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