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! This just gets better and better, doesn't it?

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. To ramp up excitement for the tour and the mash-up release, fans are encouraged to curate the release themselves by voting for their favorite classic track from each band. The top five songs from each band to receive the most votes will be included on 'NKOTBSB.' If you are such a screaming fan, pre-order before March 24 and have your name printed in the album packaging! OMG!

Besides your name if you order early, the album package includes an exclusive tour poster, personalized messages from each band member and brand-new never-before-seen photos from this thrilling collaboration.

Watch NKOTBSB Perform a Mash-Up of Hits New Year's Eve