It's party time in Ireland.

Irishman Conor McGregor quickly ended his UFC 194 featherweight title fight against Jose Aldo with a knockout win just 13 seconds into Round 1.

McGregor handed Aldo his first loss in a decade with a perfect left-handed punch that sent the Brazilian to the floor. McGregor got in a few more punches while Aldo was on the floor, and the referee was quick to put a stop to the fight after that.

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Remarkably, Aldo was able to land a powerful punch of his own while falling to the ground.

McGregor's 13-second win is the shortest in UFC history, besting Ronda Rousey's previous record of 14 seconds.