Backstreet Boy A.J. McLean in Rehab

AJ McLean - 2010 American Music Awards - 2010
Kevork Djansezian/Getty Images

Backstreet Boy A.J. McLean is in rehab, according to reports.

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. A source told US Weekly, "He wanted to go in before they opened their new tour."

TMZ first reported McLean's return to rehab.