Tiffani Thiessen turns 40 today, and what better way to celebrate than with a look at her crazy-cool '90s character, Kelly Kapowski? It's been more than 20 years since Saved by the Bell went off the air, but Bayside's best cheerleader is still No. 1 in our hearts. In the era of pay phones and scrunchies, Kelly shows how to be both a girl's girl and the object of affection for, well, every guy who ever walked into the Max. With a look at her dance moves, her signature style, and her most adorable moments with Zack Morris, take a look at 40 reasons why Kelly Kapowski still reigns as the queen of cool.