Michelle Trachtenberg's death at 39, which definitely took the public by surprise. Celebrity tributes to Trachtenberg have been rolling in, and her Gossip Girl stars like Blake Lively and Chace Crawford (among others) have shared their love for her on social media.

"Sending prayers," the actor behind Chuck Bass wrote.Ed Westwick is mourning the death of his Gossip Girl costar Michelle Trachtenberg.Westwick, who played the sleazy Chuck Bass on the CW show for six seasons,

North Texas-raised actor Chace Crawford shared a heartfelt tribute to his late Gossip Girl co-star Michelle Trachtenberg, who was found dead on Wednesday.