Sting was left furious after discovering his teenage daughter had shared a tent with Pete Doherty at the Glastonbury music festival. The Police frontman reportedly couldn't contain his anger when he was told 17-year-old Coco had become close to the troubled rocker, who has a well-documented drug addiction, at the world famous event last month. An onlooker told Britain's Mail Online website: "I was standing next to Coco's tent after Pete had played his set, and one of her friends went to check on her. She unzipped the door, and Pete was lying outstretched in her tent. "He looked very comfortable and was smoking something - the tent was full of smoke but it was impossible to tell what it was. He seemed pretty out of it, though. "Coco's father isn't too happy about her hanging around Pete because of his reputation, and hit the roof when he heard he had stayed in her tent." Aspiring singer Coco met the Babyshambles frontman in March and he has been helping her with songs for her debut album, which will be released later this year. The source added: "Coco has definitely inherited her dad's vocal skills and Pete has been raving about her talent. It's pretty clear he finds her attractive, which will only worry her dad more."