Backstreet Boys member AJ McLean and *NSYNC's Chris Kirkpatrick debuted a new collaborative single, Air, in Las Vegas on Saturday (June 5).
The dance track comes from the singers' side band, ATCK, (All the Cool Kids), which was formed by McLean, 43, and Brandon Mashburn (DJ Lux) and features a "revolving door" of musicians, such as Kirkpatrick, 49.
The surprise performance took place at the Music for Life fundraiser for the Victoria's Voice Foundation.
During the event, headliners McLean and Kirkpatrick humorously debated which of their bands is superior by going back-and-forth performing hits like Backstreet Boys' I Want It That Way and *NSYNC's Bye Bye Bye.
Show host Jeff Timmons then turned up on stage to weigh in with a remixed rendition of his band 98 Degrees' The Hardest Thing.
So, are there more collaborations in the works between the three artists and their groups?
"We're gonna announce the 98 Degrees/Backstreet/*NSYNC World Stadium Tour, come 2022," Timmons joked.
"We've always admired them and certainly would love to do something with all three together."
The musicians' hopes to continue working together shows how far they've come since the height of boy band hysteria in the late 1990s and early 2000s, during which there was often fierce rivalry and competitiveness.
Kirkpatrick admitted that he couldn't bear to be near McLean during *NSYNC's heyday.
"There was a time when I couldn't be in the same room with this guy," he said. "But there's always been a mutual respect, and now that we're all parents, we've grown up.
"Reflecting on things, it's cool to see what each of the bands did and how it all worked together. It really was this symbiotic relationship with Backstreet, 98 degrees, us and even O-Town and other bands that came in." – Reuters