Dee Devlin paid tribute to Conor McGregor as she wished him a happy Father's Day on Sunday.
The Notorious is currently away from his family as he prepares for his trilogy fight with Dustin Poirier, which takes place in Las Vegas on July 10.
Posting on Instagram, Dee said: "Sons first hero and a daughters first love, Happy Fathers Day to our King."
Dee gave birth to the couple's third child last month, with McGregor moving his training camp from Dubai to California shortly afterwards.
Announcing the birth of baby Rian on social media, the UFC star said: "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.
"My new born son, Rían McGregor."
The couple, who have been together since McGregor was fighting on small regional shows, welcomed their first child Conor Jr. in early 2017.
Then they had their first daughter Croia in January 2018, and decided to take a more private approach to her first few weeks.
Conor Jr has now become a staple of McGregor fight weeks, often stealing the show at open workouts and pre-fight media events after making his on-camera debut before his dad fought Floyd Mayweather Jr.
The name Rian is related to the Gaelic name Ryan and the meaning of the name Rian is king, it is primarily used as a male name and is of gaelic origin. It is phonetically pronounced Ree-an, and is a relatively common name in Ireland.
McGregor will likely earn a shot at newly crowned lightweight champion Charles Oliveira if he is able to win his trilogy with Poirier in July.
