A video film has been obtained which features the rocker getting high on the illegal drug after issuing a statement saying he was going to seek help.
In the pictures, Doherty can be seen chopping up five thick lines of the drug on a silver tray perched on a kitchen counter and then snorting them through a rolled-up piece of paper.
"Pete just can't stop using. He's been warned about how much he's taking but he won't stop. He says he wants to get clean but his actions tell a different story," the Mirror quoted a pal, as saying.
Last week, the 28-year-old singer vowed to return to the rehab clinic - Clouds in Wiltshire, England - where he stayed for six weeks over the summer (07), after pictures emerged of him injecting heroin.