Irishman Conor McGregor announced the arrival of his second child in an Instagram post on Friday.
UFC star Conor McGregor said "SuperMam" Dee Devlin is doing well after the birth of their second child.
McGregor announced the new arrival in an Instagram post on Friday, saying "2019 is off to the best start!".
The gender and name of the newborn was not revealed by McGregor, who shared a photo of him leaving the hospital alongside his son Conor Jr.
Long-time girlfriend Devlin gave birth to Conor Jr in early 2017.
"Heading home with my two healthy babies and an energised and healthy SuperMam," McGregor wrote. ️ "2019 is off to the best start!
"Thank you for the well wishes everybody!"
McGregor could be set for a rematch with Khabib Nurmagomedov this year, according to UFC president Dana White.
The Irishman was defeated by Khabib in the fourth round of his return to the octagon after nearly a two-year hiatus in October.
The highly anticipated bout was overshadowed by an ugly brawl after the Russian's win.
McGregor and Khabib were banned from fighting as the Nevada State Athletic Commission (NSAC) investigated the unsavoury scenes that came after their bout at UFC 229.