Tiffani Thiessen: Then
Tiffani Thiessen was chosen over future “90210” star Jennie Garth to play cheerleader Kelly Kapowski, who soon began an on-again, off-again relationship with Zack Morris that lasted throughout the show’s run. Thiessen returned for “The College Years,” allowing Kelly and Zach to rekindle their romance, which culminated in an engagement and finally a marriage in the series finale TV movie “Wedding in Las Vegas.”