Backstreet Boys honored with the 2,495th star on the Hollywood Walk of Fame

By Jaguar PS (Shutterstock)

They've been labelled competitors for more than two decades, but members of the Backstreet Boys and *NSYNC recently hit the stage together in the ultimate show of unity, making their debut as "Back-Sync" at The Grove in Los Angeles, California.

Before performing each other's biggest hits, Nick Carter and AJ McLean of the Backstreet Boys and Joey Fatone and Lance Bass of *NSYNC shared how the seeds of their friendship and new professional endeavors – including newly-announced Las Vegas engagement The After Party, featuring Carter, McLean, Fatone and Boyz II Men's Wanya Morris – were planted behind-the-scenes of their groups' perceived feuds.

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