Good thing he likes the late nights! Just a few weeks after reuniting with his fellow Saved by the Bell alums on The Tonight Show, Mark-Paul Gosselaar is back on late-night diaper duty! The actor and his wife Catriona McGinn welcomed their second baby, a daughter, on February 17th. Gosselaar shared the happy news via his Twitter account, saying, “So in love with our new baby girl, Lachlyn! Born last night 2/17 Mum and baby are healthy and happy, 2 boys, 2 girls, too perfect!” Lachlan’s older siblings are 16-month-old Dekker (with McGinn), and Ava (8) and Michael (10), from Gosselaar’s previous marriage.