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UFC star Conor McGregor and girlfriend Dee Devlin have welcomed a son into the world.

Conor Jack McGregor, the couple's first child, was born in the Coombe Maternity Hospital on Friday night, weight 8lb 14oz.

A Delighted grandfather, Tony McGregor, told the Irish Mirror that mum and baby are both doing well.

He said: "There’s great news for the McGregor’s and the Devlins.

"Baby Conor Jack McGregor was delivered last night at 8pm in the Coombe Hospital.

(Image: Instagram/thenotoriousmma)

"He came in at 8 pounds 14 ounces. The whole family are absolutely delighted.

"We’ve experienced this recently with our eldest daughter and there’s no better feeling in the world than being a grandparent. The parents are absolutely over the moon and everyone is healthy."

McGregor's sister, Aoife - whose wedding the duo attended earlier this year, has already voiced her confidence in Dee as a mum, saying: “You are going to be an amazing mother. We cannot wait to meet our nephew."

McGregor, Ireland's first UFC belt holder, and Devlin have even set up a verified Instagram account with the name 'Conor McGregor Jr'.

The page only follows Conor and Dee, while its followers include McGregor's management company Paradigm and his manager Audie Attar.

(Image: Instagram / @ConorMcGregorJr)

The UFC champion revealed late last year that the couple were expecting their first child together - and that he was "crapping his jocks" at the idea of becoming a dad.

Speaking after his victory over Eddie Alvarez, The Notorious said: "I’m gonna be a daddy early next year.

"I’m crapping my jocks. I just don't even know what way to take it."

Who is Dee Devlin? All you need to know about Conor McGregor

(Image: Instagram/thenotoriousmma)

1. She hails from Walkinstown in Dublin.

2. The couple have been together for eight years.

"She will tell you exact dates," said McGregor earlier this year.

"We've been together a long time. She's been through it all with me."

(Image: Getty Images)

3. She's always known his UFC dream

McGregor and the 28-year-old Devlin have been together long before his UFC stardom.

The fighter admitted he is incredibly thankful to his longtime love for sticking by him through everything.

He said: "My girlfriend worked very hard throughout the years and stuck by me when I had essentially absolutely nothing.

"I only had a dream that I was telling her.

"For me to be able to take her out of work, give her everything she's ever wanted and to travel the world with her fills me with pride. It keeps me going."

(Image: Internet Unknown)

4. They travel and work together

To support Conor on the road, Dee quit her job to be able to travel more.

He hired her on as an official member of his team, where she currently manages his finances.

On his girlfriend's new job, McGregor said: "She does not work anymore, I hired her to the business. She works for me now and collects the cheques."

She also helps the 27-year-old fighter train.