MAY 6 2009 13:58h
Doctors on the Caribbean island reportedly ordered the 25-year-old star to clean up her act last weekend after she was hospitalised.
Amy Winehouse will need "a miracle" to make it through her show on Friday.
Friends claim the troubled soul singer is drinking so much alcohol, she will be lucky to avoid "public humiliation" when she steps onstage with KC and The Sunshine Band at the St. Lucia Jazz Festival.
Doctors on the Caribbean island reportedly ordered the 25-year-old star to clean up her act last weekend after she was hospitalised with dehydration, but Amy has ignored their pleas.
A source told Britain's Daily Star newspaper: "Amy spends all her time boozing the days and nights away. Following her hospital visit she's done no rehearsing for her comeback show despite knowing how important it is for fans and friends in St. Lucia. Amy has gone back to her wild child ways. She's moody, erratic, drunk and volatile. Everyone around her is starting to think it will be a miracle if she makes it through her set this Friday."
The festival will be Amy's first performance of 2009 and more than 6,000 fans are expected to fly to the idyllic island to see her perform.
Amy's spokesman has denied the alcohol abuse rumours, insisting the troubled star is eagerly awaiting the show.
He said: "Amy is fine and raring to go. Her band are on their way over to St. Lucia as we speak and as soon as they arrive she will start rehearsing again and renew her commitments."
Meanwhile, Amy's father Mitch is worried the star's friends are taking advantage of her, charging expensive meals and alcohol to her expense account.
Another source said: "Mitch knows Amy has to get this comeback concert right. He doesn't want Amy to be lonely, but he doesn't see why she should pay for friends to have a good time."