Kelly Osbourne back in rehab

Kelly Osbourne has checked herself back into a drug treatment centre, only a year after completing a successful stint in rehab.

The 20-year-old daughter of Ozzy and Sharon Osbourne, checked into Pasadena, California's Las Encinas hospital on Thursday, according to American magazine US Weekly.

A friend tells the publication: "She's going to be in for a couple of weeks. She's slipped into some of her old problems and is not doing so well. Everyone is supporting her."

Another source adds: "Friends are concerned, but know that she's strong and that she's pulled through before and will this time as well."

In April of 2004 Osbourne spent time at Promises, a treatment centre in Malibu, California, for her well documented addiction to prescription painkillers.

Her brother Jack and father Ozzy have both battled drug addiction.

A representative says: "Kelly is in a facility dealing with some personal issues. She'll be back in a few weeks."