Ready for Vegas? Backstreet Boys Put on Surprise Performance at iHeartRadio Music Festival

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The Backstreet Boys gave fans a sneak peek at what their Las Vegas residency will look like when they took the stage at the iHeartRadio Music Festival for a surprise performance on Saturday.

The boy band rocked the T-Mobile Arena in Las Vegas, Nevada, performing some of their biggest hits from the last two decades in an unannounced appearance that sent fans into a frenzy.

NEWS: Backstreet Boys Finally Announce Las Vegas Residency for 2017

Nick Carter, A.J. McLean, Kevin Richardson, Brian Littrell and Howie Dorough performed a short set of their own hits, and were then joined on stage by country stars Tyler Hubbard and Brian Kelly of Florida Georgia Line for an epic rendition of their 1997 smash hit "Everybody (Backstreet's Back)."

The guys looked ready to rule the Vegas strip, rocking black and hot pink ensembles while slaying their beloved chart-toppers, including their 1999 track, "I Want it That Way."

WATCH: AJ McLean Says Backstreet Boys' Las Vegas Residency Will Be Their 'Biggest Show in 24 Years'

The news of the Backstreet Boys' Las Vegas residency, at Planet Hollywood's The Axis Theater, broke on Friday when the group released a statement announcing the new show's title will be Larger Than Life.

"If you've ever been to a Backstreet Boys show, it's going to be that on steroids," Littrell shared in the statement.

Tickets for Larger Than Life go on sale Oct. 1. The first shows are slated for March and June 2017. Check here for a complete list of dates.

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On Saturday, McLean opened up to ET about the upcoming Sin City shows, and dished on how Britney Spears influenced their decision to sign on for the residency experience.

"She literally said, 'This is the best job ever!'" McClean recalled. "She said that it's hard work, but easy in the sense that you get to be with your family more than when you’re on tour, and have somewhat of a normal life." Check out the video below to hear more from the singer about the band's exciting new Vegas run.