Lady Gaga walked the first big red carpet of her Joker: Foil for Two press tour, dressed to turn heads in a sleeveless black Christian Dior Haute Couture ball gown and Tiffany & Co. diamonds, including a large pendant necklace. To complete the look, she wore a striking black lace Philip Treacy headpiece. Her fiancé Michael Polansky posed beside her in the couple’s first major red carpet appearance.

Gaga started the day in an all-black outfit by Dior for the film’s photocall. For jewelry, she opted for diamond stud earrings from Tiffany & Co. and rounded off the outfit with high heels from Christian Louboutin.

The previous evening, Gaga attended a Warner Bros. welcome dinner for the film in a red turtleneck dress by Ferragamo.

On Instagram, she shared her complete festival schedule and added the news that the first single from her seventh album will be released sometime in October. Joker: Foil for Two will be in theaters on October 4th.

In May, Gaga spoke about her role as Harley Quinn in the film, saying she put her own spin on the DC Comics character. “You know, my version of Harley is mine and it’s very authentic to this film and these characters,” she said. Access to Hollywoodabove Deadline“I’ve never done anything like this film before, so it’s going to be completely new and really fun.”

Gaga spoke today during a press conference in Venice about working with Joaquin Phoenix, who plays the Joker. “I really enjoyed it and it was a completely different experience than I’ve ever had with any other actor,” she said via The Hollywood Reporter“He is incredibly relaxed and free.”

Alyssa Bailey is senior news and strategy editor at ELLE.com, where she oversees celebrity and royal coverage (particularly Meghan Markle and Kate Middleton). Previously, she worked at InStyle And Cosmopolitan. When she’s not working, she enjoys running around Central Park, having people take #ootd photos of her, and exploring New York City.