LOS ANGELES  - Backstreet Boy A.J. McLean has confirmed that he has entered a rehab facility.

"For personal reasons, I've checked myself into a rehab clinic," the singer says in an official statement. "With 2011 being a busy year for Backstreet, I want to be healthy and perform and sing for people at my very best and happiest. None of this will affect our current tour plans and I look forward to seeing everyone really soon! Thank you for all of your support and respecting my family and friends privacy during this time."

The singer has a history of alcohol and drug abuse but had been clean since his most recent trip to rehab in 2002.

He tweeted Sunday, "I love u all and wish me luck! I start my sober journey tomm!"

McLean had been prepping for his group's summer tour with New Kids on the Block.