The Gossip Girl family is mourning Michelle Trachtenberg. Chace Crawford, who played Nate Archibald on the CW show, posted a tribute to the late actress, who was found dead in her apartment Wednesday morning.

Michelle Trachtenberg's 'Gossip Girl' co-star Blake Lively posted a tribute to the actress after news of her death.

Following the tragedy, Gossip Girl alumni—including Blake Lively, Chace Crawford, and Ed Westwick—paid tribute to Trachtenberg, recalling sweet memories of their time spent on set together and how the actress made a lasting impression on them with her fiery spirit.