Jennifer Lawrence isn’t just a film star. The Hunger Games heroine is now a pop star, too. Lawrence lent her vocals to a song in The Hunger Games: Mockingjay, Part 1, and it is fast climbing the pop charts in the UK.

‘The Hanging Tree’ is the name of the song that People magazine describes as a ‘haunting tune.’ It has reached the Top 40 chart in the UK, presently holding the number 29 position.

Francis Lawrence directed The Hunger Games: Mockingjay, Part 1. He says Jennifer Lawrence was a wreck while singing the song on set for an important scene in the film.

“I knew she didn’t love the idea of singing, but I didn’t realize how nervous she was until when we started the first take, and she was in tears. Not totally broken down, but she was unhappy,” he said. “She would have much rather we used somebody else’s voice. I think she said she wanted Lorde [who sings the movie’s theme song] to do it!”

Jennifer Lawrence sings much the same way she speaks. No one was looking for a pitch perfect vocal performance, but rather a real girl singing a song.

Jennifer Lawrence, pop star? The song she sings in #Mockingjay has hit the Top 40 chart in the U.K. http://t.co/xfIF3Tk6uk

— People magazine (@peoplemag) November 28, 2014

“It shouldn’t sound like a professional,” Francis Lawrence adds. “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.”

Have you seen The Hunger Games: Mockingjay, Part 1 yet? What’s your take on Jennifer Lawrence as she sings in her role as Katniss Everdeen?