Chace Crawford’s camp moves fast to plant an item that he’s now enjoying a fling with new Gossip Girl castmate Michelle Trachtenberg, a rebound tryst following his heartbreaking split with Carrie Underwood — a relationship she pretty much denies ever having. But don’t get jealous, JC Chasez; it’s the same melancholy ploy as before. What one spy refers to as Chace and Michelle “flirting heavily” could easily be mistaken as the oldest in fag-hag conversation: “OMG this Cosmo is sooooo good!” “I know!!!@!%!@!”