The couple welcomed Dekker Edward Gosselaar on Monday (30Sep13) in Los Angeles.
He tells People, "We are overjoyed with the new addition to our family. We are madly in love with our little boy. He is healthy and just perfect - all we could ask for."
The actor and the advertising executive wed last July (12). Gosselaar is already a dad to son Michael, nine, and six-year-old Ava, from his previous marriage to Lisa Ann Russell.