The `My Name is Earl` star - who has eight-year-old son Pilot Inspektor from a previous relationship with actress Beth Riesgraf and three-year-old daughter Casper with wife Ceren Alkac - and his spouse will welcome a baby boy into the world in June, his representative as confirmed to People.
The happy news comes after the 41-year-old star renewed his wedding vows with Ceren in November.
The couple - who have been married for over three years - tied the knot again in an intimate ceremony with their family and friends at Club Cicada in Los Angeles.
Despite the unusual choice of name for his eldest child, Jason has previously insisted Pilot doesn`t resent him for it.
He said: "Pilot loves his name. He goes to a little hippy school where all the children have interesting names. He has a friend named Zoot. Then there`s Cosmo, and lots of others too!"