Lady Gaga debuts as Harley Quinn on set of 'Joker' sequel.

Lady Gaga was spotted in costume as Harley Quinn on the set of the upcoming "Joker" sequel, "Joker: Folie à Deux," in New York City. The singer and actress wore a crimson blazer, diamond-patterned corset top, black leather miniskirt, and diamond-patterned sheer black stockings. She was surrounded by hundreds of extras as she filmed scenes on the steps of City Hall, where protesters held signs that said "Free Joker" and "Justice for Joker." The movie, which has been described as a musical, is set to be released in theaters on October 4, 2024.