Lady Gaga announced on social media that she had been cast in “Joker 2” by sharing a musical teaser. Gaga will appear in the sequel alongside Joaquin Phoenix, who will reprise the role of the Joker after winning the Oscar for best actor for his work in the 2019 original film. The sequel is formally titled “Joker: Folie à Deux.”

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https://variety.com/2022/film/news/lady-gaga-joker-2-role-teaser-1235333485/