James introduced A. J. McLean, Howie Dorough, Nick Carter, Kevin Richardson and Brian Littrell to the audience, before joining the band members on stage for an epic performance.
James Corden is on a quest to bring back nineties boy bands
"I care about this maybe more than anything else on the planet," said James. "We are bringing back boy bands! I'm talking proper boy bands. Five guys together.
"I'm talking about the cute one, the funny one, the nice one, the other one and the maverick who refused to play by the rules, all living together in some weird mansion in Orlando.
"Now look, I am aware that boy bands haven't gone away. But now they just stand on stage wearing skinny jeans and Vans sneakers and some of them, some of them, even have the audacity to pick up instruments.
"That is not what I want in a boy band! I want matching outfits, synchronised dancing, and way over budget music videos. That's why boy bands, we're bringing you back!
"I don't want to waste any more time on this. I feel like it's already been too long. I want to bring boy bands back and I want it to happen right now!"
James then brought out the top-selling boy band of all time – the Backstreet Boys – to perform their 1997 hit Backstreet's Back.
James also made a special appearance, changing out of his suit and into black jeans and a leather jacket **to join the boys on stage. The Brit was clearly loving life as he belted out the feel-good track and danced perfectly in sync with A. J., Howie, Nick, Kevin and Brian.