Troubled Amy Winehouse has missed another opportunity to crack the US market, after being dropped from a star-studded charity event in New York.

This time, the 24-year-old singer had been granted a business visa for the US – unlike earlier this year when she missed the ceremony to pick up her Grammy because she was denied one.

But Amy, who was pictured last week looking frail and gaunt as she emerged from a London recording studio, has now been suddenly axed from the Metropolitan Museum of Art's annual Costume Institute Gala on May 5.

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Amy Winehouse ooking frail last week

"She has been told that she is no longer part of the programme," a source close to the singer tells me.

"She was really looking forward to going to America. She loves New York and has some close friends there. "But now the trip is off. It seems Amy has slipped into her old ways and even her record label were concerned she wasn't up to the trip.

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Amy has been axed from the Metropolitan Museum of Art's annual Costume Institute Gala

"It will be a huge blow for her as it would have been a great platform to break America. They love her music over there, but Amy has yet to do a tour."

A spokesman for the gala night confirmed Amy would not be appearing and told me: "She was asked if she would be interested, and she was considered, but then we moved on from her."

The singer, who has turned into a recluse in recent weeks, is suffering a skin complaint that could be related to her drug abuse. She has told friends she is worried about her image.

"Amy is staying at home as much as possible because she is so upset about her skin,' adds the source.' She is devastated her skin is in such a bad way, she's very low."