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

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.

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.

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,

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

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

Michelle Trachtenberg's co-stars and fellow celebrities are speaking out after the "Gossip Girl" and "Harriet the Spy" star was found dead Wednesday.

Blake Lively on Wednesday shared a lengthy tribute to her “Gossip Girl” costar Michelle Trachtenberg, who was found dead in her New York City apartment on Wednesday morning. Trachtenberg, also known for her roles in “Buffy the Vampire Slayer” and “Harriet the Spy,