Mark-Paul Gosselaar and Catriona McGinn welcomed their first child together on TKDATE. Credit: Tibrina Hobson/

Paging Zack Morris, daddy of three! Mark-Paul Gosselaar and wife Catriona McGinn welcomed their first child together, son Dekker Edward Gosselaar, in Los Angeles on Monday, Sept. 30, a rep for the former Saved By the Bell actor confirms to Us Weekly. Gosselaar, 39, is already father to son Michael, 10, and daughter Ava, 7, with ex-wife Lisa Ann Russell.

"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,” Mark-Paul tells Us.

Gosselaar and McGinn first announced their happy baby news in March, with the actor revealing just how excited his two older children are to meet their little brother or sister. 

"We are all really excited for the arrival of our new addition," he told Us at the time. "We've always wanted a big family. The kids are looking forward to a little sibling, and are asking a lot of funny questions right now."

Gosselaar and McGinn, an advertising executive, tied the knot in July 2012 after a one-year engagement, and the actor gushed about her interaction with his kids early on.

"My kids absolutely adore her," he previously told Us, adding that "she's stunning. And she takes my breath away!"

Prior to wedding McGinn, Gosselaar was married to Russell for 14 years. The pair finalized their divorce in May 2011.