Whitney Houston, who has struggled with addiction in the past, has admitted herself into an out-patient treatment center.

"Whitney Houston is currently in an out-patient rehab program for drug and alcohol treatment," her rep told PEOPLE in a statement. "Whitney voluntarily entered the program to support her long-standing recovery process."

The 47-year-old singer first checked into rehab in 2004. "I partied a lot. Trust me: I partied my tail off," she told ABC News' Diane Sawyer at the time, adding, "You get to a point where you know the party's over."

In 2009, the singer discussed her addiction with Oprah Winfrey, admitting that she and ex-husband Bobby Brown's drug use was "heavy" after the release of her 1992 film 'The Bodyguard.' “He was my drug,” Houston said of Brown. “I didn’t do anything without him. I wasn’t getting high by myself. It was me and him together. We were partners.”

Allegations about Houston's cocaine use began surfacing in 2010 surrounding the postponed concert dates of her first tour in years. In March, tabloids reported that Houston and her 18-year-old daughter, Bobbi Kristina, were caught doing cocaine together.

Watch Whitney Houston Talk to Oprah Winfrey About Her Drug Use