Oscar-winner Lady Gaga is allegedly in early talks to play Harley Quinn in 'Joker.

'Joker: Folie a Deux,' a musical sequel to director Todd Phillips' 2019 movie 'Joker.'

Last week, the filmmaker confirmed the sequel to 'Joker' in an Instagram post.

Also revealed that Joaquin Phoenix is expected to reprise his role as the Joker.

Sources told The Hollywood Reporter that the sequel is also a musical.

Past Warner Bros' projects have seen Margot Robbie and Kaley Cuoco star as Harley Quinn.

When the director teased the script of 'Joker: Folie a Deux,' written by him and Scott Silver, rumors were that Harley Quinn would be a part of the follow-up.

Phillips was a producer on Lady Gaga's 2018 film 'A Star Is Born,' which won her an Oscar nomination for Best Actress and a victory for Best Original Song.

The film also won an Oscar for Best Original Score for Hildur Guonadottir.

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