What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
Dustin Hoffman just goes straight for the gold!
…leaving no room for the Oscar-winning actor!
Directioners better brace themselves before they PRESS that PLAY button (above) to see the HIGHLARIOUS moment unfold.
The boys' reactions are priceless.
And we think it's safe to say that this definitely upped Niall's bachelor status! Ha!