The Associated Press is reporting that Kelly Osbourne, the 20-year-old daughter of Ozzy Osbourne, has checked herself into a drug treatment center, according to a published report.Osbourne entered the Pasadena facility on Thursday, Us Weekly reported Friday. A message left for her mother, Sharon Osbourne, was not immediately returned. A family representative told the magazine that Kelly Osbourne was "dealing with some personal issues" and would be back in a few weeks. Kelly Osbourne spent several weeks last year at a Malibu drug treatment center for an addiction to prescription pain killers. Her brother, Jack Osbourne, checked himself into a drug and alcohol rehabilitation clinic in 2003 and Ozzy Osbourne has been candid about his decades of battles with substance abuse. The siblings became international stars following the success of the MTV reality show "The Osbournes", which showed an oft-dazed Ozzy doting over his family with Sharon.