Credit: Marc Susset-Lacroix/WireImage; Gregg DeGuire/PictureGroup

Summer's only just begun, but we're already looking forward to the fall return of Gossip Girl: has reported that two new beauties are set to join the cast. Clemence Poesy, a French actress best known stateside for playing Fleur Delacoeur in the Harry Potter films, will appear in Paris-set scenes opposite Blake Lively and Leighton Meester; meanwhile, CW vet Kate Cassidy (who starred in Melrose Place and has been shooting the upcoming movie Monte Carlo with Meester and Selena Gomez) will play a Columbia student and potential love interest for Nate. We can't wait to see what happens next.