Amy Winehouse had to run off stage to be sick during a gig on Saturday night after singing just one song.

Her promoter told the audience at London’s G-A-Y nightclub that she was suffering from food poisoning but the Mirror is reporting that in fact Amy had been out drinking all day with friend Kelly Osbourne.

A backstage source told the newspaper: “Everyone knew something was up as soon as soon as she arrived smelling of booze and quite unsteady on her feet. She was also as white as a sheet and began retching before even going on stage.”

“Once she was up there, however, it was an excruciating performance and she barely got through the first number. She was sick on the side of the stage and then ran off to the toilets, followed by her management and the promoters.”

“She was quite tearful and emotional afterwards although she was so tipsy you could barely understand what she was saying. Eventually she said she couldn’t go back on and kept saying sorry over and over again.”

A member of the audience added: “Everybody started booing, heckling and stamping their feet when they heard she wasn’t returning to the stage. To make matters worse, everybody had been waiting until 1.45am for her to eventually come on.”

“The crowd at G-A-Y is normally really up for it and friendly, but I’ve never seen them so angry before.”

Amy’s spokesperson declined to comment on the drinking rumours, insisting: “She had food poisoning when she was on holiday in Miami and was still quite sick when she got back.”