Amy Stole Kate's Cocaine?!

Amy Winehouse's ex-hubby Blake Fielder-Civil is blabbing to the press about his former lady love, and not only does he talk about their wild sex life and heroin use, but he revealed that Amy stole cocaine from supermodel Kate Moss!

At a party in a private suite at NYC's Gramercy Park Hotel, Blake claims Amy went into Kate's purse and pocketed two grams of coke, but Kate was so hammered, she didn't even notice it was missing!

According to The Daily Mail, they were mingling with models and other Hollywood stars when Kate told Amy to get a $10 bill out of her handbag to snort lines with. Amy then noticed 2 grams of cocaine in Kate's purse, so she stole it and headed to the bathroom with Blake to do lines and have sex!

Something tells us this wasn't the first time the troubled singer pulled a stunt like this...think Amy's going to put behavior like this behind her?