Kelly Kapowski is all grown up -- Tiffani Thiessen turns 39 years old today!
The brunette beauty won over the world playing Kelly on "Saved by the Bell" -- and she's still the spitting image of the bubbly cheerleader!
Since starring on the high school sitcom from 1989-1994, Tiffani went on to play the manipulative Valerie Malone on "90210" from 1994-2000 and currently stars on "White Collar" as Elizabeth Burke.
Thiessen has remained a staple of the small screen -- but have her costars Mark-Paul Gosselaar, Dustin Diamond, Elizabeth Berkley, Lark Voohries, Mario Lopez, and Dennis Haskins fared as well in Hollywood?
Find out by clicking "Launch Gallery" above to see all the "Saved by the Bell" stars then and now!