They were two of the biggest boy bands to grace 90s radio waves.
Now, the "New Kids on the Block" and the "Backstreet Boys" have teamed up to tour the country as a super boy band.
Tonight, they'll take the stage at Atlanta's Phillips Arena.
But first, as you can see here, they sat down to sign autographs for excited fans.
Tonight's concert features special guest and American Idol winner Jordin Sparks.