8/21/2016 6:45 AM PDT BY TMZ STAFF
Conor McGregor celebrated his win against Nate Diaz in what UFC aficionados are calling a fight for the ages.
Conor cut loose at Intrigue Nightclub in Vegas, after beating Nate by majority decision.
The fight went back and forth all 5 rounds, but Conor eked out the win.
Niall Horan from One Direction — a fellow Irishman who predicted Conor would win by submission in the 3rd — showed up for the bash with his GF. Conor’s girlfriend Dee Devlin was also front and center.