Conor McGregor stole the show Saturday night at the Bare Knuckle Fighting Championship ... and the spirits clearly moved him.
Conor was on hand to watch Mike Perry defeat Luke Rockhold, who threw in the towel after his teeth got messed up in the brawl.
Connor, who was sipping, then swigging, his Proper 12 Irish Whiskey, toasted the crowd at the 1stBank Center and the crowd at it up.
But McGregor wasn't done ... Perry invited him into the ring and they faked a face-off That's when the Irish champ grabbed Perry's BKFC belt .