The 47-year-old has battled drug abuse in the past. She released a comeback album in 2009, but her 2010 tour was troubled: Houston canceled some dates due to illness and received negative reviews from fans who were disappointed in the quality of her voice and performance.
Whitney Houston voluntarily enters rehab
NEW YORK A representative for the superstar singer confirmed Monday that Houston is undergoing treatment. Kristen Foster says Houston is in an out-patient program for drug and alcohol treatment. She says it is a voluntary measure and part of Houston's "long-standing" recovery process.