Niall Horan knows how to party in style.
The One Direction singer marked his milestone 21st birthday last week, but waited until last night to celebrate.
While taking a break from the band's US arena tour, he jetted to Las Vegas yesterday to party the night away at XS Club on The Strip.
His good friend and fellow X Factor alum, Marvin Humes (of JLS) was in town for a DJ set thanks to David Guetta and the famous group made the most of their time in the notorious party capital.
Marvin kept fans posted of their activities on Instagram throughout the night.
"Very special night with this guy! Happy 21st Birthday @niallofficial we tore the place up! Boom," he wrote alongside a photo of them at the club.
Earlier in the day, they soaked up the sun at a pool party where they were joined by RTE presenter Eoghan McDermott and Kodaline's lead singer Steve Garrigan.
Last week, the multi-millionaire from Mullingar marked his birthday with a low-key party with pals in London.
MTV presenter Laura Whitmore, who was joined by Eoghan McDermott and Niall's brother Greg, shared a picture saying, “so apparently someone is turning 21...” and left no doubt as to who it was, with the group pictured wearing masks of the popstar.