A.J. McLeanAlthough Backstreet Boy A.J. McLean has entered rehab, it will not ruin his band's upcoming tour with New Kids On The Block.

"He doesn't want to do anything to jeopardize the success of the highly anticipated tour this summer," a source close to McLean tells PopEater.

On Thursday, McLean checked into rehab. According to several online reports, his behavior in recent weeks had been interfering with the upcoming NKOTBSB tour, and he had been advised to straighten up. He had allegedly appeared under the influence last month during a Backstreet Boys cruise.