Antonio Kamakanaalohamaikalani Harvey Sabato III was born at approximately 10:30 p.m. on Sunday. The newborn's first middle name is Hawaiian and means "a beloved gift from the heavens."
"Antonio and Cheryl are both well and couldn't be happier about the new addition to their family," Sabato's rep said in a statement to People.
Antonio III joins siblings Jack, 16, Sabato's son with Virginia Madsen, and Mina, 7, whose mother is Kristin Rossetti.
Sabato, 39, best known for his days as a Calvin Klein model and his role on General Hospital, can next be seen in the big-screen comedy Balls to the Wall.