Pop star Lily Allen reportedly collapsed at Glastonbury festival following a weekend of wild partying.

The "Hard out here" singer fell backstage at the Silver Hayes dance area at the annual music event, which took place last month. She was treated by paramedics following days of partying, reports femalefirst.co.uk.

"She went outside to sit down on the grass. Gradually, she bent over, then slid forward to lie face-down in the filthy grass. She was out of it, she didn't know where she was.

"Her friends were saying, 'You all right?' and trying to give her water. Her eyes were rolling and her chin was moving from side to side, chewing constantly," an eyewitness told The Sun newspaper.