Glenn Howerton and Jill Latiano. (Frazer Harrison/GETTY IMAGES)

The “It’s Always Sunny in Philadelphia” actor and his wife, Jill Latiano, welcomed a baby boy Monday. Howerton, looking slightly disheveled and quite unshaven, casually announced his son Miles’s arrival on Wednesday’s “Conan.”

Miles joins other September celebrity babies Xander Dane Jones and Madison Brown. (Sorry, Milo Thomas Milano-Bugliari. You’re a day late for this club.)

Watch Howerton’s interview with Conan O’Brien below.