She looked the picture of elegance earlier in the evening when she attended the Amy Winehouse Foundation fundraiser at the Dorchester Hotel.
But Pixie Lott appeared a little bleary eyed as she emerged from the Groucho Club at 2am on Thursday morning.
Getting a helping hand from a male companion the 22-year-old seemed a slightly wobbly on her feet, while flashing plenty of leg as she climbed in her taxi home.
And showing she really had let her hair down following the event, the singer’s lipstick appeared smudged around her mouth.
Earlier in the evening the star had turned heads as she posed in a floor-length scarlet red dress by British designer Alice Temperley.
Chanelling classic glamour, the All About Tonight singer accessorized her elegant dress with dark red lips, matching pearl earrings and rings from YOKO LONDON and a perfect monochrome bag to compliment her outfit.
Amy's good friends music producer Mark Ronson and The Voice finalist Tyler James were in attendance at the event, as well as Caprice, Jerry Hall, Barbara Windsor and Ortisé Williams.
Ronson produced Amy's album, Back to Black, which went platinum and won high praise from music critics globally.
The event was raising money for the foundation set up in the late singer's memory by her family to fund projects for children and disadvantaged people.
Amy's father Mitch Winehouse led the evening and explained in a heartwarming speech that his daughter had been a very charitable person throughout her life.
He recalled that on a holiday to St Lucia when she had been recovering from drug addiction, the Back To Black singer had hired horses meant for tourists to give local children rides for a month at a cost of 15,000 dollars.