Bullet Train's director revealed that Lady Gaga dropped out of the movie to go pursue House of Gucci. David Leitch told EW about the entire situation during a recent interview. After all, Bullet Train isn't that far off. But, Gaga sadly won't be along for the ride because of her engagement in the Ridley Scott film. It was a unique opportunity and the director completely understood. One fun thing about Bullet Train is how many stars they managed to pack into this Brad Pitt vehicle. Honestly, she's not even the only pop star aboard the train with Bad Bunny in the cast. Still, having two projects of this size overlap means that you have to end up choosing one. While the critical reception to House of Gucci wasn't exactly amazing, fans did enjoy the zaniness of the concept. Gaga committed to her role entirely and it's become a cult movie night favorite. However, the box office prospects were not exactly what the studio was looking for.