The 'Rehab' singer turned up two hours late for her stint as a DJ at the Monarch Pub in Camden, north London, and looked haggard, filthy and painfully thin.
Her condition was so bad that she had to struggle to walk unaided while leaving the pub and had to be supported by minders and friends.
Also, fans and friends are scared that she may go berserk this weekend during her birthday celebrations.
At one point of time, she even muttered how pleased she was that husband Blake Fielder Civil, 26, was "out of jail". However, he is still inside for assault and perverting justice and may not be free until December.
"Amy looked terrible; she couldn't even walk. To me it looked like she was a few days away from death," The Daily Star quoted a fan, who saw the singer leave the pub, as saying.