Singers Brian Littrell, Kevin Richardson, Nick Carter, A.J. McLean and Howie Dorough of the Backstreet Boys attend the 2016 Miss USA pageant at T-Mobile Arena on June 5, 2016 in Las Vegas, Nevada.
The Backstreet Boys celebrate their 21st anniversary on Sunday, April 20, 2014. That means that 21 years ago, all five Backstreet Boys performed together for the first time. To celebrate, let's look back at 21 legendary photos of the best boy band in the world.
Kevin Richardson AJ McLean Brian Littrell Howie Dorough and Nick Carter