Go travelling homeowner loan provider A.J. McLean is back … in rehab, the Daily News has confirmed. 'For personal reasons, I've checked myself into a rehab clinic,' McLean said in a statement provided to the News. 'With 2011 being a busy year for Backstreet, I want to be healthy and at my best.' McLean, who has struggled with alcohol and cocaine addictions in the past, has spent the last few months jointly performing with the Backstreet Boys and New Kids on the Block.