Mark-Paul Gosselaar a dad again: '2 boys, 2 girls, too perfect!'

#SBTB alum @MPG a.k.a. #ZackMorris welcomes baby No. 4

Time out! Mark-Paul Gosselaar has welcomed his fourth child.

The "Saved By the Bell" alum and "Franklin & Bash" star shared the news on Twitter on Wednesday morning.

"So in love with our new baby girl, Lachlyn!" he tweeted. "Born last night 2/17 Mum and baby are healthy and happy. 2 boys, 2 girls, too perfect!"

"She's a 'mouth-breather' like her Daddy. My sweet little angel," Gosselaar later posted on Instagram, sharing a sweet snapshot of a sleeping Lachlyn.

That makes two kids for Gosselaar and his second wife Catriona McGinn. The couple first welcomed son Dekker Edward Gosselaar in October 2013.

The former teen heartthrob wed his ad exec wife in July 2012 at a Santa Ynez winery.

The actor's other two kids -- son Michael, 11, and daughter Ava, 8 -- are from his 14-year marriage to Lisa Anna Russell, which ended in May 2011.

And here you thought Zack Morris only got Kelly Kapowski pregnant, as seen in their "SBTB" sketch on "The Tonight Show" earlier this month. (For the record, costar Tiffani Thiessen is expecting her second child with husband Brady Smith, not her high school sweetheart.)

Gosselaar took son Michael backstage with him during his Bayside High reunion with Thiessen, Mario Lopez and Elizabeth Berkley when Jimmy Fallon brought the talk show to L.A. two weeks ago.

"Here's @jimmyfallon with the 11 year old me tonight. Wait...what?!" he wrote.

Time in!

Follow me on Twitter @NardineSaad.

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