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Whatever all you starlets going rainbow-hued: This right here is 2015's most SHOCKING CELEBRITY HAIR TRANSFORMATION.
But seriously Matt Damon: What is going on with your hair at this press call for The Great Wall?! We're unsure if this is for a role, some sort of mid-life crisis thing, or an attempt to distract media attention away from divorcing pal Ben Affleck...but whatever it is, please say it's temporary?
That or you're currently playing the guy from Outlander's evil twin in season 2, in which case...pony tail away, man.