"What a birthday, my future wife", he wrote.
The 32-year-old two-division UFC World Champion took to Instagram on Saturday, 8 August, to share the couple's happy news with a celebratory photo of the pair of them smiling and showing off 32-year-old Devlin's huge sparkler.
McGregor and Devlin have 2 children together - 3-year-old Conor Jr. and nearly 2-year-old Croia. I only had a dream that I was telling her.
"If everything goes our way, Floyd and I would be doing something in October or November (of 2020)". She has helped me throughout this career. Conor is retired. As of right here now today, Conor is retired until Conor tells me differently, I'm not trying to make any fights for Conor. I wouldn't be doing this if it wasn't for her, and that's for sure.
White was quick to shut down the suggestion of a rematch between Mayweather and McGregor, as the UFC president did what he has started to do a lot lately - overstate the fact that Conor McGregor announced his retirement. I don't know if you heard about this, but Conor McGregor is retired.
"Thank you all for the incredible memories!"
"Here is a picture of myself and my mother in Las Vegas post one of my World title wins!"
In March 2019 he shared a similar announcement before backflipping. "Whatever you desire it's yours".
He first announced he wanted to retire from mixed martial arts in April 2016, however he was back at it that same year. "Proper Pina Coladas on me fellas!"
This week UFC boss Dana White said McGregor definitely won't be fighting in 2020, but wasn't sure beyond that.
"This year, he's retired", White said. If I do not deliver three fights a year, I have to pay them their money. Conor McGregor will not fight in 2020.
Mayweather said in December of past year, "Dana White and I are working together again to bring the world another spectacular event in 2020".