Jessica Alba is the latest to try the celebrity-loved ombre look! The actress headed to the salon for her two-tone makeover—which she got to reprise her role as the blond Nancy Callahan in Sin City 2—and Tweeted pictures straight from the salon. “She got roots, that Nancy,” the star wrote. Want to try out the trend yourself? “Start with less blond, as it’s always easier to add more,” said celebrity hairstylist David Stanwell. “With this style, you want the depth at the roots fading toward the mid-lengths, and blond at the ends fading upwards.” See more celebrity ombre styles in the gallery.