What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
We luuurve this guy!
The paparazzi caught Zachy and the show's creator/star Lena Dunham filming a scene in NYC yesterday…
And then, HBO confirmed his mystery role!
The network wouldn't spill any deets on the actor's involvement or character name — but last we left Hannah, she was accepted into the prestigious Iowa Writers’ Workshop.
SO perhaps the handsome star is helping her tie up loose ends in Bushwick!
We can't wait to see him on the small screen again!