Music icon Whitney Houston has re-entered rehab for drug and alcohol abuse, her spokeswoman said May 9.

Kristen Foster said the 47-year-old singer, who dominated pop music charts in the 80’s and 90’s and released a comeback album in 2009, is currently in an outpatient program “to support her long-standing recovery process.”

Foster didn’t release further details, as doing so would “conflict with (Houston’s) privacy,” but noted that Houston is receiving treatment voluntarily.

News Web site The Daily Beast reported that this is Houston’s third stint in rehab, following trips in 2004 and 2005.

Rumors surrounding Houston’s drug addiction began more than a decade ago, when airport security guards in Hawaii recovered drugs in her luggage in 2000, but the singer didn’t openly admit to her drug use until a 2009 interview with Oprah Winfrey.

During the video interview, she told the talk show host that marijuana laced with cocaine was her substance of choice. In a 2002 interview with Diane Sawyer, Houston alluded to using cocaine, pills and marijuana and but revolted at the idea that she did crack cocaine.

“First of all, let’s get one thing straight,” she said. “Crack is cheap. I make too much money to ever smoke crack. Let’s get that straight. Okay? We don’t do crack. We don’t do that. Crack is whack.”

It is unclear how long Houston will remain in treatment, or where she is being treated.