Jennifer Lawrence said that as soon as she took the role of Katniss Everdeen in The Hunger Games, she knew her life would change. And first thing to alter was her hair colour! She went over to the dark side after accepting the role, adopting Katniss' signature brunette hair for the hotly-anticipated book adaptation and we have to say it suits her! Here she is on her way to film Late Show With David Letterman in NYC yesterday. What do you think of her new look?