Mark-Paul Gosselaar & Catriona McGinn Expecting First Child Together

Josh Duhamel and Fergie at The American Red Cross Annual Red Tie Affair

Mark-Paul Gosselaar is expecting a baby with wife Catriona McGinn.

“Mark-Paul Gosselaar and wife Catriona are thrilled to announce they’re expecting their first child together in September,”  a rep for the Saved By the Bell said in a statement to US Weekly.

“We are all really excited for the arrival of our new addition. We’ve always wanted a big family,” Gosselaar tells. “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.

Gosselaar is already dad to son Michael, 9, and daughter Ava, 6, with ex-wife Lisa Ann Russell.