What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
The twerking craze has hit the boys of One Direction!
Or at least, it's hit Niall Horan, but we're not so sure he caught it right.
In fact, we're not even really sure what kind of dance move he had going there! Booty pop? Booty shake? Squat?
[Image via Will Alexander/WENN.]