Everyone who grew up in the 80's-90's remembers Tiffani Thiessen. She played sweet, loving, innocent Kelly Kapowski  on 'Saved by the Bell' and mean, conniving Valerie Malone on 'Beverly Hills 90210.' I used to get all the time that I look like her when she was on '90210. We do both have the heart-shaped face. Today Tiffani turns 40 years old, so in honor of her birthday here is a little video for you guys to enjoy!