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Chuck, Nate, Blair, Serena and Lola team up to uncover what they think is an explosive secret between Diana and Jack. Meanwhile, Dan is offered a prestigious fellowship in Rome for the summer.

Desmond Harrington, Elizabeth Hurley, Ella Rae Peck, Marina Squerciati, Zuzanna Szadkowski, Berto Colon, Caprice Benedetti, Christopher Stadulis, Kelly Briter