Kelly Osbourne has checked herself into a U.S. rehabilitation center, according to her mother Sharon. The daughter of rock legend Ozzy is being treated for undisclosed reasons.

The 24-year-old previously spent time in rehab in 2004 as a result of drug abuse while her and her family were filming reality TV show The Osbournes and was admitted to a drug treatment center in Pasadena, California after a relapse in 2005.

Her mother Sharon tells RadarOnline.com, "Yeah, Kelly's in rehab. What else can we say? She knew that it was the right thing to do at this point and we're proud that she did it. The family is all standing behind her. Kelly knew that she needed help and she's getting it.

"This is one of the absolute worst things that a parent can face, for their child to go through rehab. And not once, but twice. However, we are all very glad Kelly's doing it."

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(This news article provided by World Entertainment News Network)