Some ego-maniacal celebs just HATE IT when new kids come in on the path they paved. They can't stand the thought of anyone out-shining them.
But as the Backstreet Boys demonstrated at London's fabulous 02 Arena this week, just because one boy band's light is shining doesn't mean another one's is dimming!!
Oooh NO! The fire that BSB put in the world's heart will live FOREVER!!
So when they combined their classic style with One Direction's modern What Makes You Beautiful (above), the crowd went CAH-RAE-ZEE!!
(And when we saw it, we kinda did too LOL!)
Sigh… reminds us of our birthday magic… such a great group of guys, no?