Karlie Kloss is just 15 years old, but she walked 64 shows this past season. Like all those designers, we too fell in love with her signature mesmerizing death stare. Naturally, we couldn't wait to get her on video camera for a real, live runway lesson. Her trick is to keep her chin down and not crack up when the urge emerges. In our afternoon with her, we also dragged her into the dance studio to show us a few pirouettes (she's a skilled ballerina, too — how else would she know how to manage those heels?). Also, Molly Sims stopped by to ensure Kloss makes it to a pivotal high-school event. Watch and find out which one.