Sorbo, 46, and his wife, actress Sam Jenkins, 40, are expecting their third child, People magazine reported Wednesday.
Married since 1998, the couple have two children, Braeden, 4 and Shane, 1. People said Shane broke a hospital record when he was born last year at 12 pounds, 6 ounces.
Sorbo is known for his TV roles in "Hercules: The Legendary Journeys" and "Andromeda." He played in the 1997 action film "Kull the Conqueror."