Whitney Houston has returned to rehab, her representatives have revealed.

The soul diva has entered an outpatient programme for drug and alcohol treatment according to Kristen Foster, her spokesperson. "Whitney voluntarily entered the programme to support her long-standing recovery process," said Foster.

No further comment was made, and it is not known where Houston is being treated or how long she will remain there.

Houston's drug issues are well documented. However, when she returned in 2009 with an acclaimed new album, I Look to You, she declared herself healthy and clean.

The album spawned the hit single Million Dollar Bill, but the accompanying tour proved a troubled affair, with some fans complaining about the quality of Whitney's voice and performance. When three concerts in the UK were cancelled due to illness, she shrugged off suggestions she was using again as "ridiculous," telling People magazine: "I don't even read it, I don't even respond."

Whether this latest episode is a relapse or merely a setback, only time will tell. Houston recently performed onstage with Chaka Khan during a Prince concert in Los Angeles.

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