Don't Miss:

On Monday’s episode, Blair—looking tres chic in a polka-dot Bensoni dress, Roger Vivier shoes and Cacharel purse—is being hotly pursued by Louis, a dashing young man that B suspects is part of Monaco’s royal family. Her former flame, Chuck, is busy “starting over” in the City of Lights with a new woman, Eva (played by Clemence Poesy). Serena is on the lookout for Chuck at her mother Lily’s request, and back in New York, Nate meets a young student, Juliet (played by Katie Cassidy), who helps him scheme a plan to win back Serena’s heart. Tune in to the CW at 9 p.m. EST Monday night to watch the sure-to-be juicy episode, and click through the photo gallery for head-to-toe credits of what the gals (and guys) will be wearing!