The double-boy-band headliner of New Kids On The Block and the Backstreet Boys adds more shows.

The two iconic, harmonic, swoon-factories are set to kick off their big double-headliner in June in the US and will cross the continent for 37 shows.

Another 16 have been added, to go on sale on January 15. They will even dip into Vancouver and Toronto during the trek.

Both bands teamed up to perform at the American Music Awards last November and rang in 2011 on Ryan Seacrest’s New Year’s Rockin’ Eve.

The girlie hysteria might even forgive the unfortunate acronym the tour has been given – ‘NKOTBSB’. Strange.

All of this hype is a good sign for the possibility that they may extend the tour internationally…