Tiffani Thiessen Joe Scarnici/WireImage, NBC

Happy 40th birthday, Tiffani Thiessen. It’s hard to believe that Kelly Kapowski has entered her fourth decade. But the Saved by the Bell star is definitely all grown up. The former Miss Junior America is now a devoted mom to 3-year-old daughter Harper (with actor husband Brady Smith). The actress proudly shows off her little look-alike (blue eyes and all) to her almost-250,000 Twitter followers. Besides starring as Elizabeth Burke, wife to FBI agent Peter Burke (played by Tim DeKay), on the USA Network series White Collar and voicing a recurring role as Misty the Wonderful Witch on the Disney Junior animated show Jake and the Neverland Pirates, Tiffani and interior designer Lonni Paul have a high-end nursery furniture line, PetitNest: It boasts stylish bedding and luxe cribs (like the $2190 “Duke” crib, named after Giuliana and Bill Rancic’s son). Celebrate Tiffani’s 40th birthday by taking a look at how she and other ’90s teen stars changed from then to now.

'90s Teen Stars

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—Serena Kappes