Jennifer Lawrence fell out with Joy director David O. Russell after she was asked to sing on screen.
Jennifer became embroiled in a major row with director David O. Russell while they were filming their latest movie collaboration Joy, and the actress has now revealed the argument was sparked by a singing scene.
She was reluctant to show off her voice on camera, and was "very rude" and "grumpy" on set.
"It was a fight," Jennifer tells Access Hollywood. "But it's also like, once I get hired for a movie, I have to do what I came to do. I can argue and say I don't want to do it, but I have to do it. I didn't do it (the singing scene) very willingly. I didn't have a good attitude about it. I was very rude, very grumpy and very mean to David. He'd try to come over and whisper 'Merry Christmas' to make me feel better and I told him to get away from me."
The Oscar winner previously performed a track called The Hanging Tree for last year's (14) The Hunger Games: Mockingjay - Part 1, but later insisted she has a "tone deaf Amy Winehouse voice" even though the song became a chart success across the world.
Jennifer recently played down her on-set argument with the director, but admitted she was not very nice to David, who she previously worked with on Silver Linings Playbook and American Hustle.
"I was... mean on set (while making Joy)," she told Vogue magazine. "I wasn't mean to anybody but David. I would never be mean to somebody who couldn't be mean back. But when you really love somebody, you fight with them.
"There have been times where I've said, 'We should go to couples therapy'."