Saved by the Bell: Teen Idols Turned ParentsAs the latest to welcome a little one, Elizabeth Berkley joins cast mates Mark-Paul Gosselaar, Tiffani Thiessen and Mario Lopez in expanding her family

TIFFANI THIESSEN

Daughter Harper calls the shots at home, and Thiessen and husband Brady Smith are happy to sit back and watch their 2-year-old grow. "She's not a baby anymore. It's funny," said the actress formerly known as Kelly Kapowski. "From the 12-month to the 15-month mark has probably been her biggest stretch of [milestones]."