McGregor holds his newborn aloftCredit: Instagram

Mum Dee beams with the newbornCredit: Instagram

It is the couple’s fourth childCredit: Instagram

He posted: “My baby boy is born! Mammy and baby doing amazing, 8.1lbs of prime Irish double champion beef!”

The childhood sweethearts’ eldest is Conor Jr, six, and they also have daughter Croia, four, and son Rian, two.

McGregor revealed the impending birth of their fourth with a picture of himself and a heavily pregnant Dee.

He said: “Up early tomorrow to bring our new baby boy in to this world, say a prayer for us! Let’s go Mammy.”

McGregor met Dee when he was 19 and the couple have been inseparable ever since.

They welcomed Conor Jr into the world in May 2017, just months before McGregor’s £100million payday against boxing icon Floyd Mayweather.

Daughter Croia came in 2019 with son Rian arriving in May 2021.

In August 2020, McGregor proposed to Dee but the happy pair are yet to marry.

The Irish superstar has been in Dubai training for his impending UFC return, eyed for next year.

He has not fought since July 2021 when he broke his leg in just the first round against Dustin Poirier, 34.

McGregor, 35, is now in line to face Michael Chandler, 37, in his return after the two coached on reality series The Ultimate Fighter.

UFC president Dana White warned the comeback fight could be postponed until the summer of 2024.

But there is still hope McGregor will return before that amid rumours of a huge headline on the historic UFC 300 card, which is without a date.

8McGregor has not returned since breaking his leg against Dustin PoirierCredit: Getty8Dee and McGregor with their children, Croia, Conor Jr and RianCredit: Social Media Collect

The Irishman training for his UFC returnCredit: Instagram @thenotoriousmma

McGregor is set to fight Michael Chandler in his UFC return