Jennifer Lawrence enters the UK Top 40 As if things weren't already going well enough for Jennifer Lawrence - known to millions as Hunger Games heroine Katniss Everdeen - she has now cracked the UK Top 40. The emotive song - on which the 24-year-old Hollywood star sings - was co-written by composer James Newton and folk-rock band The Lumineers, with lyrics by Suzanne Collins, author of the "Hunger Games" books. Laurence had to sing the song on set, as an integral part of one particular scene. And, despite the Oscar-winning actress's exceptional confidence and ability in front of the camera, she seems not to have found it easy. "There are very few times when Jen gets nervous about stuff she has to do on set," Mockingjay director Francis Lawrence told Vulture, "and the singing was that kind of a thing ... I didn't have to talk her into it, she was going to do it, she knew it was her job, but she just wasn't happy about it. 'Oh man, I've got to actually sing! In front of 150 people!'  Yet her naturalistic tones were apparently exactly what the director was after. "But see," he continues, "the thing on top of all of it is, it shouldn't sound like a professional. It should sound like a real girl singing. So she did it. She did it all day. And she has a really cool sound to her voice. There's kind of a raspy texture to it. So it was not terrible in the slightest.