Mark-Paul Gosselaar, Wife Catriona McGinn Expecting First Child Together

Mark Paul Gosselaar and Catriona McGinn attend the 9th Annual Triumph for Teens at Hotel Bel-Air on June 6, 2012 in Los Angeles, California. Tibrina Hobson/

Mark-Paul Gosselaar is going to be a dad again! The Saved By the Bell actor, 39, is expecting a baby with wife Catriona McGinn, his rep confirms to Us Weekly.

"Mark-Paul Gosselaar and wife Catriona are thrilled to announce they're expecting their first child together in September," his rep says in a statement to Us. Gosselaar is already dad to son Michael, 9, and daughter Ava, 6, with ex-wife Lisa Ann Russell.

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

The Franklin & Bash actor and advertising executive McGinn tied the knot in July 2012 after becoming engaged in July 2011.

"Catriona's great with my kids," Gosselaar previously told Us. "My kids absolutely adore her."

And the soon-to-be father of three also had wonderful things to say about his wife. "Catriona's absolutely gorgeous. She's stunning," Gosselaar gushed. "And she takes my breath away!"

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