NKOTBSB was a supergroup consisting of the members of American boy bands New Kids on the Block and Backstreet Boys.
Howie Dorough of the Backstreet Boys came up with the name, which is a combination of established initialisms of each groups' names, NKOTB and BSB.
Together they have released one compilation album, the eponymous NKOTBSB, one single, and toured in North America, Europe, Australia, and Asia in 2011 and 2012.