Oscar winner Lady Gaga is in early talks to star opposite Joaquin Phoenix in Warner Bros.’ Joker: Folie à Deux.

Details as to the Joker sequel’s plot have thus far been kept under wraps, though we know that Todd Phillips is returning as director. As was the case on the original film, he co-wrote the script with Scott Silver.

Speculation that Harley Quinn would appear in the movie first bubbled to the surface after Phillips posted the cover of the screenplay to Instagram on June 7. The subtitle, Folie à Deux, refers to a shared delusional disorder, and Joker’s only real companion has been Quinn, a character first created for "Batman: The Animated Series" in the early 1990s.

All other details about "Folie à Deux" remain under wraps, so it’s unclear whether Gaga would also contribute any music to the project, but it’s a safe bet that it’s at least on the table. Gaga worked with Phillips in his capacity as one of the producers of 2018's "A Star Is Born", which earned Gaga an Oscar nomination for best actress and an Oscar win for original song.

Character details on this incarnation of Quinn are currently under wraps, although generally, the character is a psychiatrist turned sidekick of Joker after falling in love with the criminal. The report also notes that Phoenix’s deal to return isn’t completely set but negotiations are "deep into" finalizing a deal.

Source: Press Release