New Kids On The Block kicked off their “Right Stuff” residency in Las Vegas and it got crashed by the Backstreet Boys.
As NKOTB members asked who wanted to marry them back in the '90s, Backstreet Boy Howie Dorough held up a sign that read, "I Do."
AJ joined Howie onstage to hug it out with their rivals. And yes, the fans went wild. Both bands are currently playing in Vegas.