Lily Allen says she was "drunk for three weeks straight" while on a tour that included New Zealand.
The singer also says she made ridiculous back stage demands while performing on the Big Day Out tour across Australia and New Zealand.
The 33-year-old singer rocketed to fame with the release of her debut record 'Alright, Still' in 2006, and has revealed the fame brought with it a string of raucous partying that saw her stay drunk for almost a month, as well as develop "bratty pop star behaviour".
In an interview with Remix magazine, which comes out today, she said: "I don't know how I got through those Big Day Out shows in Australia and New Zealand because I was drunk for three weeks straight.
"One year, the last one that I did, there was a massive heatwave in Melbourne because those forest fires had just happened. It was excruciatingly hot.
"This was at the height of my bratty pop star behaviour. I demanded to have a miniature beach built outside my dressing room, with a paddling pool filled with ice and actual sand all around it."
But now that she's older and wiser, Lily admits her new album 'No Shame' has been the first material she's truly been proud of in over a decade, as she's shifted her focus onto making music she likes.
She added: "I made a conscious decision at the beginning of this record to really focus on my own creative output.
"I have worked harder on this record than any other in my career — it couldn't be more honest and more me. Not in a profoundly earnest way, but I think I questioned what I'm making and why I'm making it.
"It took me a while to come to terms with what now seems so obvious - I make music I like that I hope other people are going to like as well."
The 'Trigger Bang' hitmaker admits that now, the things that "matter" to her are her music career and her two children.
Speaking to Remix, she said: "That's it. I make the shows as good as they can be and I'm as good a mum as I can be. Those are the things that matter, the music and my children."