Well, that was quick.

Mark-Paul Gosselaar didn't waste any time showing off his newborn baby girl, Lachlyn, to the world. Just one day after her birth, the 'Saved by the Bell' alum shared this sweet snap on Instagram — and it seems like their father/daughter bond is already stronger than ever!

"She's a 'mouth-breather' like her Daddy. My sweet little angel," he wrote.

mark paul gosselaar baby

But Mark-Paul isn't the only one beaming with happiness over his bundle of joy. Former co-star Mario Lopez reached out to the 40-year-old yesterday on Twitter to congratulate him on his newest addition.

mark paul gosselaar baby tweet

Lachlyn is the actor's second child with wife Catriona McGinn, and fourth child overall. He has two kids, Michael, 10, and Ava, 8, from his previous marriage to Lisa Ann Russell.

mark-paul gosselaar family

Mark with his family in October 2014.

Congratulations to the growing family!