Lady Gaga Exudes Harley Quinn Glam Alongside Fiancé Michael Polansky at “Joker Folie à Deux” London Premiere

The couple made their red carpet debut at Venice Film Festival earlier this month

Leave it to Lady Gaga to shut down a red carpet.

On Wednesday, Sept. 25, the 38-year-old superstar had a glam date night with her fiancé, Michael Polansky at the London premiere of her new film Joker: Folie à Deux. She also posed for photos with her costar, Joaquin Phoenix.

The actress embraced her role as Harley Quinn in a dramatic red gown by Celine by Hedi Slimane. Polansky wore a classic black suit by Celine Homme by Hedi Slimane.

Gaga's floor-length dress featured a v-neckline and pleated skirt. Over top, the singer wore a cropped long-sleeve jacket with voluminous puffy sleeves. Her Tiffany & Co. jewelry elevated the look even further; she was adorned with a Jean Schlumberger by Tiffany Bird on a Rock brooch, Vigne ring, with a bracelet and earrings in platinum and 18k yellow gold with Fancy Intense Yellow diamonds.

Related: Lady Gaga Talks Joker: Folie À Deux's 'Rough and Tough Energy' in Exclusive Behind-the-Scenes Video

A nod to her character's iconic makeup look, the star donned a theatrical makeup look consisting of turquoise eyeshadow, winged liner and a teardrop made of crystals under one eye. She's also still rocking the bleached eyebrows she debuted in August. To finish off the look, the "Bad Romance" singer wore red lipstick to match her gown.

Her hairstyle tied into her outfit as well. A departure from the icy blonde color she wore for Venice Film Festival earlier this month, Gaga opted for a black bob cut with red highlights and short bangs.

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Gaga and Polansky, who went public with their relationship in 2020, made their red carpet debut at the Venice Film Festival premiere of Joker: Folie à Deux on Sept. 4.

At the Italian event, the star stole the show in a voluminous black gown with a plunging neckline and massive skirt. Her sparkly lace Philip Treacy headpiece, however, was the standout element. She accessorized with Tiffany & Co. jewelry and platform boots.

Joker: Folie à Deux is a sequel to the 2019 Joker. Premiering on Oct. 4, the film tells the backstory of Phoenix's Joker and his love story with Harley Quinn, a role previously taken on by Margot Robbie, Mia Sara and Kaley Cuoco.

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"My version of Harley is mine and it's very authentic to this movie and these characters, and I don't want to give anything from the movie away," she told Access Hollywood on the red carpet of her Gaga Chromatica Ball screening and dance party on May 23. "I think it's really something you have to experience in the theater."

"This film has music, it has dance, it has amazing acting in it," she added. "I loved working with Joaquin, I loved working with [director] Todd [Phillips]. What I will say is that I've never done anything like I've done in this movie before, so it's all going to be completely brand new and really fun."

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