It's Tiffani Thiessen, you guys! Whether you had a crush on her as sweet cheerleader Kelly Kapowski on Saved by the Bell, devoured her every calculating move as Valerie Malone on Beverly Hills, 90210, watched her cook for celebrity friends on Dinner at Tiffani's, or are revisiting her with your kids on Netflix's charming Alexa & Katie, it's hard not to be in awe of how long the actor has been a pop culture presence. This week Tiffani sits down with Perrie to talk about the first time she truly felt like a movie star, what it's like literally growing up in front of America, how her style has changed since having two children, and the '90s fashion trend she single-handedly started.   For more on this episode, visit glamour.com/whatiworewhen. Follow @tiffanithiessen on Instagram and Twitter. Watch her as Lori Mendoza on Alexa & Katie on Netflix. Find Pull Up a Chair, her cookbook, and You’re Missing It, the children’s book she wrote with her husband, Brady Smith, in bookstores and online.