*NSYNC's JC Chasez Poses with Backstreet Boys After Vegas Concert | TMZ TV
*NSYNC's JC Chasez Poses with Backstreet Boys After Vegas Concert | TMZ TV

Boy band worlds collided at the Sphere in Las Vegas ... because *NSYNC superstar JC Chasez hit up the venue to see the Backstreet Boys ... and he was treated like royalty.