Joker: Folie à Deux was confirmed earlier this month.

Lady Gaga is reportedly in talks to star as Harley Quinn the Joker sequel. Last week, Joker director Todd Phillips confirmed a sequel to the acclaimed film was underway, sharing an image on social media of actor Joaquin Phoenix reading a script for the film, which is called Joker: Folie à Deux. The Folie à Deux title is a reference to a medical condition where two or more people start sharing delusions. As this would suggest, it doesn't look like Phoenix will be alone in the sequel and, according to The Hollywood Reporter, Lady Gaga is in talks to star as Harley Quinn in the film. https://www.instagram.com/p/CehX0rGPxQi/ This would not be the first big screen appearance for Gaga. The pop megastar received widespread praise for her performance in 2018's A Star Is Born, and last year had a starring role in House of Gucci. She has also already worked with Phillips, who directed A Star Is Born. Of course, in recent years Harley Quinn has been portrayed on screen by Margot Robbie who has played the Joker's sidekick and romantic partner in three DC films. However, Phoenix's Joker was set in a different universe to these films, meaning all roles are up for grabs, and that's if the film's creators even decide to use DC characters that already exist. The sequel is also apparently set to be a musical, which may explain the desire to get one of the biggest voices in music involved in the film. On its release in 2019, Joker was a monumental critical and commercial success. The film made more than $1bn at the global box office and was nominated for 11 Oscars. Phoenix himself picked up both the BAFTA and the Academy Award for best actor as a result of his performance in the film.