[custom_adv] Nicole Kidman has been blond for the past few years, but she got her start with her natural auburn hair. [custom_adv] Benedict Cumberbatch dyed his hair darker for his roles in "Sherlock" and "Dr. Strange," but his hair is naturally red. [custom_adv] Laura Prepon has had dark hair for the past seven years because of "Orange is the New Black," but she rocked her red hair in "That '70s Show." [custom_adv] Seth Green has had almost every hair color under the sun, but he's a natural ginger. [custom_adv] Catherine O'Hara has been blond during her run on "Schitt's Creek," but before that she kept her natural hue. [custom_adv] Ewan McGregor has dyed his hair darker for roles before, and has even shaved his head for parts. [custom_adv] Bridget Regan has switched back and forth between her natural red and dyed black hair.