Lady Gaga and Joaquin Phoenix from the Joker sequel, Joker: Folie à Deux.Gaga, who plays Harley Quinn in the upcoming film, shared a picture of her in character as she announced filming on the sequel had come to an end.In an Instagram post on Thursday (April 6), Gaga wrote: “That’s a wrap. X, Harleen.”Director Todd Phillips also shared the photo alongside a new image of Phoenix in the lead role, with the caption: “That’s a wrap.