Mom Sharon Osbourne confirmed the news to RadarOnline.
"Yeah, Kelly's in rehab," Sharon said. "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."
While Sharon refused to name the facility where Kelly is chillin', she did say it is outside of Los Angeles. Rumor has it that Kelly Osbourne is actually staying at Hazelden in Oregon -- one of the best programs in the country.
So what's she in for? Sharon refused to say. "Kelly will tell you herself when she gets out," she promised.
"We just pray that everything's going to be okay."
This is Kelly's third trip to rehab. The first two were to treat a painkiller addiction, so it is likely that this time is for the same.
Sharon is the only member of the odd little four-member family who has not been in treatment; both son Jack and hubby Ozzy have attended in the past. Ozzy's famous addictions threatened to break up the family -- and kill him -- until he cleaned up his act.
Kelly recently turned herself in to police after she was charged with assaulting a British gossip columnist in defense of her man.
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