Despite a long battle and somewhat of a ‘comeback’ for the Backstreet Boys, A.J. McLean is now back in rehab.

According to TMZ, McLean’s drinking was affecting rehearsals for the Backstreet Boys’ upcoming joint tour with New Kids on the Block. On Sunday, McLean wrote on his twitter,

“I love u all and wish me luck! I start my sober journey tomorrow!”

In 2001, the Backstreet Boys postponed their ‘Black & Blue’ world tour so McLean could enter treatment for alcohol abuse, depression and anxiety.  He was reportedly six years sober in 2008.