Mark-Paul Gosselaar and his wife Catriona McGinn welcomed their very first child together around noon on Monday, September 30 in Los Angeles, People
The new addition, named Dekker Edward Gosselaar, joins Ava Lorenn, 7, and Michael Charles, 9 --Gosselaar's children from a previous marriage.
"We are overjoyed with the new addition to our family. We are madly in love with our little boy," the Franklin & Bash star, 39, told the magazine. "He is healthy and just perfect — all we could ask for."