Whitney Houston Whitney Houston

Whitney Houston has voluntarily enrolled in an out-patient rehab program for drugs and alcohol treatment, her rep told People.

See how Houston has changed through the years

According to TMZ.com, which first reported the news, Houston enrolled in the program 10 days ago, and she is allowed to be in public, as long as she has a monitor.

The 47-year-old singer, who released her seventh studio album in 2009, has had a troubled history with substance abuse. She checked into rehab in 2004, two years after a now-famous interview with Diane Sawyer, during which Houston said "crack is whack" but admitted to using cocaine, alcohol, marijuana and various pills. She sought treatment again in 2005.