The child arrived Monday. He has been named Dekker Edward, reports people.com.
"We are overjoyed with the new addition to our family. We are madly in love with our little boy," Gosselaar said.
The 39-year-old actor is now a father of three children including daughter Ava and son Michael from ex-wife Lisa Ann Russell.
Gosselaar and McGinn had exchanged vows in July 2012. They had announced McGinn's pregnancy in March this year.
--IANS (Posted on 01-10-2013)