By Sadie Gennis,
Mark-Paul Gosselaar is going to be a dad again! The Saved by the Bell alum and his wife Catriona McGinn "are thrilled to announce they're expecting their first child together in September," the actor's rep told People.Gosselaar has two children from a previous marriage.Photos: Give these stars a show!"We are all really excited for the arrival of our new addition. We've always wanted a big family," Gosselaar told the magazine. "The kids are looking forward to a little sibling, and are asking a lot of funny questions right now."The Franklin & Bash star wed McGinn, an advertising executive, in July after a yearlong engagement.
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