Sharon Osbourne, mother of 24-year old Kelly Osbourne, who co-presents Radio 1's Sunday Surgery, confirms her daughter is back in rehab for the third time, and will undergo treatment in the US for the next four weeks.

In 2004, Osbourne, who underwent treatment for addiction to painkillers, was re-admitted a year later. Sharon Osbourne said: 'Yeah, Kelly's in rehab. The family is all standing behind her.' adding: 'She knew that it was the right thing to do at this point and we're proud that she did it.'

MTV reality show The Osbournes, which focused on the family life of rock legend Ozzy and wife/manager Sharon, helped put Kelly Osbourne on the road to fame. A short-lived career in pop music, and she picked on presenting for a career, working with Radio 1 since 2007.

Her UK representative confirms that Kelly 'has voluntarily entered a medical facility to address some personal issues.' Last summer, Kelly was arrested for slapping a reporter in a London nightclub, later released on bail, with a March hearing scheduled.