Jennifer Lawrence showed off her newly dyed hair last night when she stopped by the Late Show with David Letterman, officially there to stump for X-Men: First Class. The superhero prequel doesn’t come out for a few weeks yet, but Lawrence is probably going to be pretty busy, as filming for The Hunger Games starts up this week. The actress awkwardly charmed the late night host with a story about riding wild horses as a child and messing up her coccyx (hee hee, coccyx!) before getting into the high-profile projects she’s working on. Most amusingly, she distinguished The Hunger Games from Twilight as “A violent futuristic movie where kids are randomly selected from their home districts to fight to the death. But we don’t drink blood, that’s just sick.” Check out a clip from Lawrence’s trip to the couch below.