CONOR MCGREGOR has been accused of punching an Italian DJ and breaking his nose during a party celebrating his son's christening.
The UFC star travelled to the Vatican with his family on Friday for a lavish ceremony as his five-month-old son Rian was christened.
Afterwards, McGregor's family headed to the five-star St Regis Hotel in Rome for an afterparty, with Francesco Facchinetti handling the music.
Mr Facchinetti claims that the Dublin-born fighter assaulted him in the early hours of the next morning, breaking his nose and splitting his lip open.
The attack, he says, was totally unprovoked.
Facchinetti branded McGregor a "really violent and dangerous" person, and he took to social media to show off his split lip.
"The very famous McGregor, who punched me in the mouth, broke my nose in front of 10 witnesses, his friends and his bodyguards," he said on Instagram.
"He attacked me without motivation as we talked for more than two hours and we also had fun together.
"I could have shut up and not said anything to anyone, but since I’m here to tell it, I must say that person is really violent and dangerous. The thing that saddens me the most, besides being one of Conor’s fans of the first hour, is that real fighters don’t behave like that.
"They know they have guns instead of hands and they certainly don’t punch the first random one in front of them. He could throw it at my wife, any of my friends in that room. I trust in the authorities and in the Italian law. We welcomed him as a hero and instead he’s just a bully of the worst kind ... what a disappointment. He will also have 50 million followers, money and power, but I don’t care, I’ll go straight to the end."
Facchinetti says he's contacted the police and intends to take legal action.
Mr Facchinetti's wife Wilma Helena Faissol also alleged: "Out of nowhere, he threw a punch in the face of Francesco.
"He was inviting us to another party. Francesco said, 'OK let’s go' and he hit him. Luckily, he [Francesco] was very close so he [McGregor] couldn’t load up on his punch.
"Then they took him away. I turned on the light and the guards turned them off. Francesco was bleeding. I wanted to help him and the guards chased us."