Niall Horan & Louis Tomlinson Party in Las Vegas

VIDEO Niall partying with Diplo in Las Vegas last night! #2 – 12.09.15 – pic.twitter.com/vprIyEGtp6

— ▲▼1D Updates ▲▼ (@1DVanctyUpdates) September 13, 2015

VIDEO || Louis and Niall in Vegas today, September 13th pic.twitter.com/5u06LXghmh

— 1D Updates! (@OfficialWith1D) September 13, 2015

Niall Horan celebrated his 22nd birthday in Las Vegas last night, September 12. He and his One Direction bandmate, Louis Tomlinson flew to Las Vegas after they performed in Boston.

Niall and Louis were spotted hanging out with Diplo who DJed at XS nightclub. One Direction completed the North American leg of their On the Road Again tour last night, as well.

Boston to Las Vegas in one night, what rockstars!