He wrote on Instagram: “What a birthday, my future wife!”
World Snooker Championship stars McGill and Clarke urged to …
The comment section was filled with congratulations, including from coach John Kavanagh and training partner Dillon Danis.
Devlin has been by McGregor’s side since he started his MMA career – the Notorious made his debut in 2008.
They are now set to make things official after the big news of their engagement.
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Start of the decade ➡️ end of the decade ❤️ #foreverlove
The couple have two kids together, three-year-old Conor Jr and daughter Croia.
His christening was a typically lavish event which took place near Dublin at Luttrellstown Castle.
The venue was also used by David and Victoria Beckham for their wedding back in 1999.
Among the guests were McGregor’s coaches John Kavanagh and Owen Roddy.
McGregor and Devlin chose to dress their son in a white suit and posted several photos of the day on Instagram.
Their daughter was born in January 2019 and she was treated to a magical christening party eight months later.
Devlin, 32, is McGregor’s No1 fan and even quit her job to be able to support him.
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Happy Birthday to my everything ❤️Let’s celebrate you today babe 🎉 I love you ❤️
Devlin travels everywhere with the Irish superstar.
He then hired her as an official member of his team, putting her in charge of his finances.
Since his 2013 UFC debut, McGregor has gone on to reach superstardom becoming the promotion’s highest paid star.
His 2017 boxing super-fight with Floyd Mayweather also contributed a major part to his £90m net worth.
But the Crumlin-born scrapper also runs a successful whiskey business, after launching Proper 12 in 2017, as well as a clothing line with David August.
They live together with their two children in a stunning £2million mansion, which used to belong to a son of former Taoiseach Albert Reynolds.
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The Paddocks near Straffan, Co Kildare, sits behind an elite gated Ladycastle community at the K Club, famed for being host to the Ryder Cup in 2006.
The property has five bedrooms, six bathrooms, a living room, dining room, kitchen, and games room.
McGregor has plenty of time to plan their big day, after announcing in May he would be retiring for the third time in four years.