New Kids on the Block and Backstreet Boys are touring this summer as NKOTBSB — and this ultimate boy band partnership is taking things a step further by releasing a true mash-up album, fittingly titled ‘NKOTBSB.’

The release will feature fan-selected favorites and classic hits from both million-selling groups, as well as the very first songs recorded by the fused super boy band! The album is due out May 24 via Legacy Recordings. The first single is ‘Don’’t Turn Out the Lights,’ which is one of those first new songs where NKOTB and BSB sing together.

But that’s not all. ‘NKOTBSB’ will also boast newly recorded mash-ups of smash hits from both groups, similar to their first televised performance as an on-stage collective on the 2010 AMAs!

The boy bands will tour together for the first time this summer, including a rare, “must see” show at Boston’s Fenway Park on June 11.

via NKOTBSB Mash-Up Album Due Out May 24 - PopCrush.

Here's a mashup of some of their greatest hits, performed for the first time together at the American Music Awards last November: