What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
The One Direction guys are very proud of their girlfriends and we don't blame them!
They're all gorgeous!
After working the red carpet — filled with screaming fans — the taken members of 1D had grabbed the manicured hands of their very lucky girlfriends (or fiance) as they headed to the after party for their This Is Us London premiere at the Sanderson hotel.
Meanwhile, Harry Styles and Niall Horan were ready to party it up solo.
Too bad they didn't invite their new lady friends! This could've been the PERFECT opportunity to fly them out for some fun times!
Regardless, we're sure they had plenty of options to keep their beds warm that night! ;)
[Image via BauerGriffinOnline.]