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.

"Michelle was one of a kind,” Crawford–who played Nate Archibald on the popular CW series– began his Instagram post, which showed the pair taking a selfie. The Boys actor could be seen sporting some scruff and a dark suit, while a black-haired Trachtenberg–who played villain Georgina Sparks– wore a black lace dress.