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.

Michelle Trachtenberg's former co-stars from “Gossip Girl” and "Buffy the Vampire Slayer" paid tribute to the actress following her untimely passing on Wednesday.

Lively shared a photo of the day she met Trachtenberg, writing, "The world lost a deeply sensitive and good person"

Blake Lively and Alyson Hannigan are among the former "Gossip Girl" and "Buffy" actors mourning the death of their one-time co-star, Michelle Trachtenberg.

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.

Gossip Girl' alums Ed Westwick, Chace Crawford, Taylor Momsen, and Kevin Zegers paid tribute to Michelle Trachtenberg after her tragic death at 39

Blake Lively paid tribute to her late 'Gossip Girl' co-star Michelle Trachtenberg, who passed away at 39. Lively described Trachtenberg as an electric presence and deeply sensitive individual. Other 'Gossip Girl' stars,

Michelle Trachtenberg, famed for her role as Georgina Sparks on Gossip Girl, was found dead in New York City at 39. Her co-stars Ed Westwick and Chace

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

Sarah Michelle Gellar, Taylor Momsen and Blake Lively are among those paying tribute to Michelle Trachtenberg, who died Wednesday