Sad news from Backstreet Boy, A.J. McLean's Twitter Account today as he tweeted "See u on the other side!" AOL News is reporting that the singer is back in rehab for a 3rd time to beat his addiction to drugs and alcohol.

The announcement comes as the Boys -- who formed in 1993 -- are preparing for a nostalgia-filled summer tour with boy-band statesmen New Kids on the Block.

In a statement released to People, McLean said that his treatment would not impact the NKOTBSB tour. "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," he wrote. "None of this will affect our current tour plans and I look forward to seeing everyone really soon!"

See a Backstreet Boys video from happier times:

See more on AOLNews.com.