Mark-Paul Gosselaar & Wife Welcome Son

It's a boy! 

Mark-Paul Gosselaar and his wife Catriona McGinn welcomed their very first child together around noon on Monday, September 30 in Los Angeles, People reports.

Pics: Celebs and Their Cute Kids!

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."