Ex-UFC featherweight and lightweight champion Conor McGregor and his fiancée Dee Devlin have welcomed their fourth child, a baby boy. "My baby boy is born...Mammy and baby doing amazing, 8.1lbs of prime Irish double champion beef!" McGregor tweeted. He also shared pictures of the newborn on Instagram, writing, "Another chunky healthy boy into the world. Dee you are my hero."