In an interview ahead of her ICA gig, the 23-year-old, who married Blake Fielder Civil in May, recently revealed that she had to get her wedding ring resized because she kept losing it.
"I had to have my wedding ring resized. It got too big and I kept losing," the Daily Mail quoted her as saying.
At the event, the singer made her fans wait for about 50 minutes as she went to Selfridges.
"Amy was busy stocking up on eye make-up at the Stila counter. Giles Deacon was hosting a party for Intel at the Moet & Chandon champagne bar and Amy was invited up for a drink but said she had a gig to go to," a source said.
However, the 'Rehab' singer gave a delightful performance at the gig, which came as a relief to her long-waiting fans.
The singer has been dubbed the female Pete Doherty and is becoming more and more infamous as a no-show.
Winehouse's self-destructive behaviour has made many worry that one of Britain's young talent is doomed.