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In a flashback, Lily runs away to Los Angeles, reconnecting with her parents. Back in present day, Blair and Nate attend prom together, but the evening doesn't turn out as planned.

Amanda Setton, Caroline Lagerfelt, Connor Paolo, Dreama Walker, Michelle Trachtenberg, Nicole Fiscella, Yin Chang, Zuzanna Szadkowski, Abby Walker, Alex Ruiz, Andrew McCarthy, Bess Rous, Brittany Snow, Cynthia Watros, Jerrika Hinton, Joe Hickey, John Roney, Krysten Ritter, Matt Barr, Miles Fisher, No Doubt, Ryan Hansen, Shiloh Fernandez