Popsugar Beauty Hair Katherine Heigl's New Brown Hair Colour Katherine Heigl Isn't Blond Anymore, and Boy Does She Look Different 5 September 2019 by Sarah Siegel Image Source: Getty / Jeff Kravitz While you might think Katherine Heigl as the eternal blonde in 27 Dresses, Knocked Up, and Grey's Anatomy, the actress is switching up her look for a new role. The star just revealed her new dark brown hair colour on Instagram, complete with soft layers and sleek styling. On Twitter, the actress explained that she became a brunette for her role as Tully Hart on the upcoming Netflix series Firefly Lane. While this look is drastically different than the colour we're used to seeing her in, we think dark hair totally suits her. Ahead, check out Heigl's before and after of her new brown hair. Katherine Heigl With Dark Brown Hair View this post on Instagram A post shared by Katherine Heigl (@katherineheigl) on Sep 3, 2019 at 7:51pm PDT 1 / 3 Katherine Heigl With Blond Hair View this post on Instagram A post shared by Katherine Heigl (@katherineheigl) on Feb 9, 2019 at 7:10pm PST 2 / 3 Katherine Heigl's Hair Transformation The Tully Hart transformation! #FireflyLane @netflix pic.twitter.com/Hxgoxszf7L— Katherine Heigl (@KatieHeigl) September 4, 2019 3 / 3 HairCelebrity BeautyBeauty TrendsBeauty NewsHair ColourKatherine HeiglCelebrity Hair