After much speculation, it is now confirmed, Lady Gaga is in Joker 2.  Gaga confirmed the role in this teaser video.    She captioned the video Joker: Folie a Deux ..October 4^th 2024.   The title means “shared madness.”  She will play Harley Quinn!    Joaquin Phoenix will return as The Joker. AND It also looks like the sequel will be a musical.