It's almost 20 years since they first formed, and six years since their last reunion as a five-piece. And today the Backstreet Boys were all back in force again.

The five-piece group graced the Good Morning America stage, performing some of their classic hits, to a packed out crowd at Rumsey Playfield in New York's Central Park.

For the first time since 2006, Nick Carter, Brian Littrell, Howie Dorough, A.J. McLean, Kevin Richardson belted out the likes of I Want It That Way and Everybody (Backstreet's Back).

They sang Incomplete for their opening number.

Richardson, 40, recently rejoined the group three months ago, following his 2006 exit. He told the assembled fans about his return: 'I'm a person that follows my heart and gut, and my heart said this is the time.'

The Backstreet Boys have sold a staggering 130m albums worldwide - and are currently the top trending topic in the world following their GMA appearance.

The band is now working on a new album, set for release next spring to mark their 20th anniversary.