This weekend Jessica Alba chronicled her latest hair color change on her Instagram account, from the prelightening conditioning treatment to the finished ombré look (pictured lower right). The hair reinvention is in preparation for her recurring role as Nancy Callahan in Sin City 2. "She got roots that Nancy," Jessica quipped of the grown-out effect. But this isn't the first time she's made a big hair color switch. Jessica has also worn both cherry red and light honey blond shades, in addition to her signature brunette waves. Tell us: Which hue do you prefer on Jessica?