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It's a girl! Mark-Paul Gosselaar welcomes baby daughter, Lachlyn Hope

Mark-Paul Gosselaar just gave "Saved by the Bell" fans a new reason to be so excited: His fourth child, a baby girl named Lachlyn Hope.

Mark-Paul Gosselaar just gave "Saved by the Bell" fans a new reason to be so excited: The actor has welcomed his fourth child, a baby girl named Lachlyn Hope.

"So in love with our new baby girl, Lachlyn!" he tweeted Wednesday afternoon, adding that his gender-balanced brood of two boys and two girls is "too perfect."

Lachlyn is Gosselaar's second child with Catriona McGinn, whom he married in July 2012. The couple's son, Dekker Edward, arrived in October 2013.

Mark Paul Gosselaar and Catriona McGinnTibrina Hobson/WireImage

Gosselaar is also father to Ava Lorenn, 8, and Michael Charles, 10, from his previous marriage to Lisa Ann Russell.

The actor, 40, shared an adorable Instagram photo of baby Lachlyn snoozing peacefully with the caption "She's a 'mouth-breather' like her Daddy. My sweet little angel."

In December, he confirmed McGinn's pregnancy, telling People, "It’s something we’re really excited about and we’ve been planning for a while. I love big families. There’s nothing better than a happy child."

And of course, art imitates life: In Jimmy Fallon's "Saved by the Bell" skit earlier this month, Gosselaar's character, Zack Morris, learned that girlfriend Kelly Kapowski was pregnant.