“This is insane. I’m losing my mind,” AJ McLean told a sold-out crowd at Sphere Las Vegas on opening night of the Backstreet Boys ’ Into the Millennium residency . “I’ve cried at least four times since we’ve been up here.”

McLean wasn’t the only band member overcome with emotion during Friday’s nostalgic, otherworldly trip down memory lane. Kevin Richardson became so choked up he couldn’t sing his verse of “The Perfect Fan,” while Brian Littrell cried next.

Nick Carter was meanwhile fighting tears before he even rose onstage for 1999’s anthem “Larger Than Life,” which had audience members seemingly dancing through space while dodging meteorites thanks to Sphere’s immersive visuals.

“This is insane. I’m losing my mind,” AJ McLean told a sold-out crowd at Sphere Las Vegas on

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