Mark-Paul Gosselaar, New Wife Expecting First Child Together (VIDEO)

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(Photo: Twitter/MarkPaulGosselaar)Mark-Paul Gosselaar (R) with his "Franklin & Bash" co-star.

Mark-Paul Gosselaar and wife Catriona McGinn are expecting their first child together, the former "Saved By the Bell" star tweeted. Gosselaar already has two children from a previous marriage and said that his kids are excited for a new brother or sister.

"We are all really excited for the arrival of our new addition," Gosselaar told People magazine. "The kids are looking forward to a little sibling and are asking a lot of funny questions right now."

Of course, Gosselaar was too polite to reveal what some of those questions may be, but they're sure to include the classic, "Where do babies come from?" that all moms and dads are asked. Gosselaar's two children, Michael and Ava, will have a different mother than their new sibling, but that hasn't even dawned on them yet.

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

The two married in July after a year-long engagement. They chose to have a small, intimate ceremony with a few friends and family in attendance. Gosselaar's children took part in the wedding and, he revealed, were instrumental in its planning.

"I'm too type-A to let it happen around me. We're trying to make it as traditional as possible. It's going to be fun!" Gosselaar told People at the time.

"He was so excited to have found the woman of his dreams. He couldn't wait to propose!" friend and ring designer Neil Lane told the magazine.

The couple vacationed in Italy, but Gosselaar was soon back at work filming "Franklin & Bass" for TNT. The show has enjoyed success and allows Gosselaar to portray a fun, yet more serious, role than his original character of Zack Morris.

While fans have clamored and hoped for a "Saved By the Bell" reunion, no such plans are in the works. The show was immensely popular in the early 1990s, and fans around the world have fallen for the lovable schemer Zack Morris.

Watch Gosselaar talk about "Franklin & Bash" HERE: