Being directed by David Leitch, the film will also reportedly feature performances from Joey King, Aaron Taylor-Johnson, Zazie Beetz, Brian Tyree Henry, Andrew Koji and Masi Oka.
This isn't the only acting role Gaga is preparing for, either. She's also set to appear in Ridley Scott's Gucci in 2021 where she'll play Patrizia Reggiani, the ex-wife of Maurizio Gucci. Robert De Niro, Al Pacino, Jared Leto, Adam Driver are also appearing in that project.
Gaga is also coming off an Oscar-winning performance in the Bradley Cooper-directed A Star Is Born, while Pitt is coming off his recent Oscar-winning performance in the Quentin Tarantino-directed Once Upon a Time in Hollywood.
Stay tuned for more details.