Now this is what we call a quick-change artist.
The 21-year-old was only briefly flirting with the dyed locks for her part in Adult World and, judging by how long she kept the strands afterward, obviously wasn't a fan of the dark side.
Roberts was back out in Hollywood this week, hitting up a cocktail party and showing off her slightly blonder hair.
Makes sense, seeing as how the starlet has readily admitted to being "happier" with a paler hue. So welcome back, Emma!
Tell us, which hair color do you prefer on the actress?