Completely new look!

Gaga as hot “Lady in Red” at “Joker” premiere

Lady Gaga appeared with a new hairstyle and hair color at the premiere of "Joker: Folie à Deux" in London.(Bild: APA/AFP/BENJAMIN CREMEL)

Hot, hotter, Lady Gaga! The singer and actress once again lived up to her reputation as a fashion chameleon: she appeared as a sexy "Lady in Red" with a new hairstyle at the London premiere of "Joker: Folie à Deux".

Lady Gaga's look at the premiere of the new "Joker" flick in London's Leicester Square on Wednesday evening was a real eye-catcher in more ways than one.

Gaga as a hot "Lady in Red"
The 38-year-old appeared on the red carpet in a fiery red Celine dress tailored to her by designer Hedi Slimane.

Lady Gaga wore a Celine gown by designer Hedi Slimane in London.(Bild: APA/Scott A Garfitt/Invision/AP)

The actress wore a short jacket with dramatic puffed sleeves over the fabulous designer dress, which fell into a flared skirt from the thighs and created an exciting neckline.

New hair color!
But it wasn't just Gaga's outfit that caused a flurry of flashbulbs. The Oscar winner had swapped her long blonde mane for a wine-red bob haircut with short bangs for the premiere in the UK.

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Gaga, who posed for the photographers with her fiancé Michael Polansky on the red carpet, also had her eyes rimmed in a striking turquoise green. There was also a glittering tear under her right eye - a nod to her look as Harley Quinn.

Gaga as Harley Quinn
Gaga can be seen alongside Joaquin Phoenix in "Joker: Folie à Deux". The film is the sequel to Todd Phillips' acclaimed 2019 thriller, which celebrated its world premiere at the Venice Film Festival in September.