Conor McGregor is a new dad

Irish mixed martial arts star Conor McGregor is celebrating the birth of his third child.

The Ultimate Fighting Championship (UFC) fighter and his fiancee, Dee Devlin, have welcomed a baby boy named Rian, a little brother for their son, Conor Jr., four, and daughter Croia, two.

Sharing a photo of himself with his newborn on Instagram on Monday, McGregor wrote, "The McGregor Clan is now a family of 5...

"Healthy baby boy delivered! Baby and Mammy Wonder Woman are doing great!"

"God I thank you for everything you give to me and my family in this world," he added. "My new born son, Rian McGregor (sic)."

The couple, who announced their engagement last summer after 12 years of dating, announced their pregnancy news at Christmas.

McGregor has plenty to celebrate - he also recently topped Forbes magazine's annual list of the highest-paid athletes, raking in a reported $180 million (£130 million) over the past year to claim the title for the first time.