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Mark-Paul Gosselaar Expecting First Child with Wife Catriona

Mark-Paul Gosselaar and Catriona McGinn
Mark-Paul Gosselaar, who is best known for his role on the 1980s sitcom "Saved by the Bell," has announced that he and his wife, Catriona McGinn, are expecting their first child together.  More from US Weekly:

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."

Image: Mark-Paul Gosselaar and Catriona McGinn, via Joe Seer /