CONOR and Dee Devlin, his fiancee, had a christening at the Vatican for their son Rian on Saturday.
McGregor's family, which includes McGregor's sisters Erin, and Aoife, arrived in Rome yesterday to prepare for today's ceremony.
Conor McGregor seen at the Vatican's son's christening
Conor was seen looking smart in a blue suit, complete with tie and waistcoat at the event.
Dee Devlin, his long-term partner, welcomed his third child in May. This was just before Dustin Poirier's trilogy fight.
The Notorious is still healing from the severe broken leg that he sustained in his loss to the Diamond.
McGregor is now on the road again with his clan, SunSport reporting that McGregor's return from surgery was ahead of schedule
After their trip to America, the Dublin native arrived in Rome earlier in the week. He was presented with the Key to Miami.
McGregor was even spotted with four security guards while out shopping with Devlin at the Eternal City.
McGregor was seen pushing Rian's stroller on Friday as he was performing dad duties.
McGregor, who was wearing a black suit and Devlin a floral orange dress, pushed his son's pram along the cobbled streets.
As the two-weight world champion in MMA was leaving the luxurious Hotel De La Vilee, a crowd of MMA fans surrounded him.
McGregor reserved the entire terrace at the hotel for Friday night's dinner.
The former featherweight and lightweight champion shared several photos to his Instagram Story, where he shared them with his 42.6 million followers.
Jose Mourinho was even able to bump into McGregor. The Special One took pictures alongside McGregor while McGregor tried his Proper No12 Twelve Whiskey.
The Roma gaffer posted the images to Instagram and said, "Yes it is him!"
"Yes, @thenotoriousmma is here in Rome. It was a pleasure to meet him, share stories, and offer him the most beautiful shirt @officialasroma.
"He did a miracle. It's impossible not to say yes to Conor. I had to try @properwhiskey."
