In the upcoming musical sequel, the Poker Face singer plays Lee, a new take on Harley Quinn, alongside Joaquin Phoenix as Arthur Fleck/Joker. The A Star is Born actress explained to Empire magazine that she will not be singing flawlessly like Lady Gaga in the film, but as the untrained Lee. "For me, there's plenty of bum notes, actually, from Lee. I'm a trained singer, right? So even my breathing was different when I sang as Lee. When I breathe to sing on stage, I have this very controlled way to make sure that I'm on pitch…”