Lady Gaga may be joining the star-studded cast of David Leitch’s upcoming assassin thriller film, Bullet Train.As reported by Collider, the Oscar-winning singer and actress has apparently joined Brad Pitt, Zazie Beetz, Brian Tyree Henry, Joey King, Aaron Taylor Johnson, Andrew Koji, Masi Oka and Michael Shannon for the film.The script, written by Zak Olkewicz, is based off Japanese author Kotaro Isaka’s novel, Maria Beetle.