One person who was particularly impressed by her attire was the mum of radio presenter Clara Amfo, who hosted the red carpet event at the capital's Odeon Luxe in Leicester Square.
Amfo also stunned with her look as she dressed in a black suit with pink lapels and, proud of her outfit, she send a picture of it to her mum, who had the most hilarious response.
Read more: House of Gucci first reactions
"Wow.. nice suit and a smart lovely blouse," said Amfo's mother Gracie in a screenshot the presenter shared on her Instagram.
"Nice pair of shoes to match the outfit. Looks elegant! Hair style nice," she continued before asking the important questions: "Who’s this lady that you’re talking to and what event?"
Amfo replied to her oblivious mother, explaining that it "Her name is Lady Gaga, she is a singer and an actress". She added that's she's the star of a new movie about Gucci.
"Sweet salute to the lovely @gucci team for the H2T adornment and styling," wrote Amfo in the caption to her post. "Those platforms made my feet so happy… and House Of Gracie approves, everyone’s a winner!"
Many of Amfo's fans and colleagues also loved her mum's reaction with Capital Breakfast’s Lilah Parsons commenting:"'Who’s this lady' oh I miss WhatsApp Mama."
Radio 1’s Ali Plumb also added: "Your mum is so amazing, we need a Jack Whitehall-type show ASAP."
Famous names also flooded Amfo's comments complimenting her on her looks. Miquita Oliver wrote “Love this hair Clara!!!”, while Claudia Winkleman added "KNOCKOUT", Johannes Radebe sent some heart-eyes emojis and Ria Hebden commented "Shine girl".
Giving her own short review of the movie – which is out in cinemas on November 26 – Amfo wrote: "This film is exquisitely cast Ridley Scott didn’t fuck about, it’s the right mix of high drama, comic relief from some of it’s more tragic figures with an added sprinkle of camp to keep you engaged for the whole 2h45."
Watch: Lady Gaga as the Gucci heiress in the 'House of Gucci' trailer