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Move over Rebecca Romijn -- we're all about Jennifer Lawrence as Mystique!

Director Bryan Singer tweeted this hot shot of J. Law on the Montreal set of the film and wrote, “First look: #JenniferLawrence as a vengeful #Mystique. #XMen #DaysOfFuturePast."

Jennifer will be starring opposite her ex-boyfriend Nicholas Hoult ... wonder if they'll be able to keep things platonic after he gets a peek at her like this?