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Miley's not the only one switching up her look these days!

Jenna Dewan-Tatum has lopped off her long brunette locks and gone blonde ... and short! Channing Tatum's wifey posted this picture on Twitter and wrote, "Oh, and the new hair is just for a role guys...started a new movie today :)."

We don't see any new projects listed on her IMDb page, so we're dying to know more about her new gig!