The 33-year-old star, who had been working on the look for more than a month, was unbuttoned by an entourage of umbrella-wearing dancers.9Lady Gaga stripped off before writhing on the stairsCredit: Getty Images – Getty9She bent over the stairs in New YorkCredit: Getty Images – Getty

The dress has four different stages, with the enormous pink outfit being unbuttoned to a black number, then a pink dress.

Finally, she was left in little more than lingerie, writhing on the pink steps outside the event.

One fan gasped: “OMG GAGA!! QUEEENNN!!💓👏🏻.”

Singer and actress Gaga, 33, is co-chair of this year’s super-fancy event, alongside tennis ace Serena Williams and former 1D star Harry Styles.

9The singer arrived in a billowing pink parachute dressCredit: Getty Images – Getty9The next layer was a black dress which she teamed with an umbrellaCredit: Getty Images – Getty9The billowing dress was then unbuttonedCredit: Getty Images – Getty9She writhed on the pink steps after getting undressed

They have to arrive before all the other stars because one of their tasks is so line up and shake hands with the hundreds of guests as they file in.

The theme for the this year’s gala, one of the biggest events in the fashion calendar, is ‘Camp: Notes on Fashion’.

The gala sees models, musician and sportspeople dressing up in aid of charity, with tables – which you have to be invited to buy – costing up to £230,000.

The fashion ball, which is organised by Vogue supremo Anna Wintour, raises funds for the Metropolitan Museum of Art’s Costume Institute.

9The star knelt on the stairs after getting undressedCredit: Getty Images – Getty9She was surrounded by an entourage of male dancersCredit: Getty – Contributor9Her helpers lifted her dress into the sky before unbuttoning herCredit: Getty – Contributor