Backstreet Boys surprise fans with performances in elevator

Backstreet's back, ALRIGHT! 

These fans were in for a huge surprise when they stepped into an elevator in the MTV office to find the Backstreet Boys waiting for them. 

The boys proceeded to treat the fans to sing-alongs of their hits 'I Want It That Way' and 'As Long As You Love Me'. What a throwback! 

Check out the clip above, we guarantee you'll be singing along.