In June, director Todd Phillips announced that he and co-writer Scott Silver had completed their script for Joker: Folie à Deux with it rumoured that the singer/actress was in the running to play Harley Quinn opposite Joaquin Phoenix as Arthur Fleck/Joker. On Thursday, Gaga posted a teaser clip on her Instagram page which featured silhouettes of herself and Phoenix as Joker. Cheek to Cheek, a song that the 36-year-old has performed many times alongside Tony Bennett, served as the soundtrack.