As if the forces of New Kids on the Block and Backstreet Boys weren't mind-boggling enough, Boyz II Men recently made grown women (and men) weep when they appeared at a recent NKOTBSB show to perform 'End of the Road' with the super group.

Diehard boy-band fans shrieked like prepubescent teens when Nathan Morris, Shawn Stockman and Wanya Morris hit the stage in Orlando, Fla. on July 22, and who could blame them? The epic collaboration was bursting with multi-layered harmonies, a veritable smorgasbord of sound for '90s music lovers.

The audience was also graced with Boys II Men hits such as 'Motown Philly' and 'I’ll Make Love To You.' Unfortunately, 'N Sync was nowhere to be found.

Boyz II Men are set to release their new album, 'Twenty,' this fall. The 2-disc set will contain 10 new songs, as well as 10 newly recorded and updated versions of 'End of the Road,' 'I’ll Make Love to You' and 'Bended Knee.' Already in the studio with super producers like Babyface, Jimmy Jam and Terry Lewis, Dallas Austin, Teddy Riley, Rob Knox and more, the album will feature new music from the Philadelphia trio for the first time in a decade.

Watch NKOTBSB Perform 'End of the Road' With Boyz II Men