Conor McGregor has announced the name of his new baby just days after he introduced him to fans.
The fighter's partner Dee Devlin recently gave birth to couple's fourth child together.
The UFC star shared the news with fans on 30 November via social media, saying that his long-term girlfriend and newborn son were both 'doing amazing'.
The Irishman also shares son Conor Jr (born 2017), daughter Croia (2019) and son Rían (2021) with Devlin.
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The couple have been together since 2008 after meeting in a nightclub as teenagers.
He finally proposed back in August 2020, but they're happy not totally tying the knot for now.
One night before welcoming his third son, McGregor shared a snap of his heavily-pregnant partner and him with the caption: "Up early tomorrow to bring our new baby boy in to this world, say a prayer for us! Let’s go Mammy."
The once family of five had reportedly been sunning it up in Dubai beforehand, giving the Irish pair a glowing tan before becoming parents for a fourth time.
And this evening (4 December), McGregor shared a new snap of the newborn, revealing his name: "Say hello to Mack McGregor everyone."
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Fans were quick to comment with the punny 'return of the Mack'.
As another pointed out: "Mack enters the world just in time for the Return of the Mac."
That's all of course a reference to the UFC star preparing for his return to the Octagon.
McGregor was forced to take a lengthy hiatus from the sport after breaking his leg during a clash with his lightweight rival, Dustin Poirier, back in July 2021.
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And now, after his two-year break and an extension to his brood, he's set to battle it out with Michael Chandler sometime in 2024.
The pair starred on reality series The Ultimate Fighter together, where they both coached contestants.
No date or venue has been set for their face-off yet, but McGregor is going to have his hands seriously full at home.
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Other fans pointed out the dressing on the newborn's little hand, saying he's 'wrapped already'.
"Dude is 0 years old and he has already wrapped his arm for sparring. His father's son," One wrote.
And many echoed: "Aye! Little pal got his first hand wrap. Training starts early in the McGregor family!"
Another joked: "Look at those guns," as they call him a 'future heavy weight champion'.
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Welcome to the world, little Mack.
Featured Image Credit: Instagram/@thenotoriousmmaTopics: Conor McGregor, Parenting, Celebrity, Sport