Conor McGregor has been fined €1,000 for punching a man in a south inner city pub in April.
The former two-weight UFC champion entered a guilty plea at Dublin District Court on Friday after his initial hearing in the morning was adjourned.
The court was then shown CCTV footage of the incident in a Drimnagh pub which McGregor offered the victim Des Keogh a shot of his Proper Twelve whiskey.
The victim declined and McGregor slammed a shot glass down in front of him before punching him on the left side of his face.
McGregor's solicitor told the court that the fighter apologised to Mr. Keogh who accepted his apology.
Addressing the court, McGregor said: "I assure you nothing of this nature will happen again regarding me."
McGregor, who is worth more than €115million, has one month to pay the fine.
His solicitor Michael Staines told Judge Teresa Kelly that his client has already paid Mr Keogh an undisclosed sum of money.
