It’s no joke: Lady Gaga is in talks to join Joker 2.

Like Harley Quinn.

According The Hollywood ReporterGaga would ‘play Harley Quinn’ if she finalizes a deal to make the movie – which is too apparently a musical.

Last week, Joker Director Todd Phillips confirmed the long-running project is moving forward with an Instagram post of the film’s script, titled Joker: Madness for Two, a reference to a medical condition where “the same or similar mental disorder that affects two or more people, usually members of the same family.” If the Joker is involved, the only character he would canonically share a mental disorder with would be Harley Quinn.

THR writes that “it’s unclear whether Phillips and company are using other DC characters or striking alone, as they did in many cases with their first film.”

The DC Extended Universe already has its own Harley Quinn, Margot Robbie, who played the Joker’s occasional girlfriend in suicide squad, Birds of prey and The Suicide Squad. But Joker is not set in the same DC Comics universe as these films; the first film, starring Joaquin Phoenix as the Joker, was set in the past and showed a man named Arthur Fleck, who slowly becomes a man and adopts the Joker identity and inspires the people of Gotham City in dark ways and frightening.

Despite the movie not featuring Batman (at least not an adult Batman; a young Bruce Wayne had a small cameo role), Joker was a smash hit for Warner Bros., grossing $1.07 billion worldwide. Phoenix won the Best Actor Oscar for his performance and has repeatedly stated that he would be interested in reprising the role. But facing Lady Gaga in a musical? I don’t think anyone saw that coming.