Little more than a year after completing treatment for an addiction to prescription painkillers, Kelly Osbourne has once again checked herself into a drug rehabilitation center, according to a spokesperson for the singer.

The 20-year-old daughter of heavy-metal godfather Ozzy Osbourne, whose electronica-tinged sophomore album, Sleeping in the Nothing, hits stores Tuesday (see [article id="1501103"]"Kelly Osbourne, Sophomore LP On The Way, Is Ready To Earn Her Fame"[/article]), entered Las Encinas Hospital on Thursday -- the same Pasadena, California, facility where younger brother Jack underwent treatment for his addictions to the painkiller OxyContin, marijuana and alcohol back in 2003 (see [article id="1473670"]"Jack's Addiction: Jack Osbourne Talks About His Addiction And Recovery"[/article]).

A spokesperson for Osbourne said she was "dealing with some personal issues."

In April 2004, she spent several weeks at the Promises treatment center in Malibu, California, where such celebrities as Ben Affleck, Robert Downey Jr., Charlie Sheen and Tim Allen have received treatment (see [article id="1486155"]"Kelly Osbourne Checks Into Rehab For Painkiller Addiction"[/article]).