Sarah Michelle Gellar, Taylor Momsen and Blake Lively are among those paying tribute to Michelle Trachtenberg, who died Wednesday. Trachtenberg was found in her New York apartment “unconscious and unresponsive,

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,

Blake Lively, who co-starred with Michelle Trachtenberg on the teen drama "Gossip Girl," paid tribute to the late actress on Wednesday.

Blake Lively honored her former “Gossip Girl” co-star Michelle Trachtenberg following news of her death. Trachtenberg, who portrayed Georgina Sparks on the CW show, was found dead at the age of 29 on Feb.

Michelle Trachtenberg's death Wednesday left her former co-stars like Blake Lively, Rosie O'Donnell, Melissa Gilbert and Kenan Thompson shocked and saddened.

Blake Lively's remembering her former costar Michelle Trachtenberg ... saying she always gave 200% effort and she always stood up for what she believed in.

Friends and costars of Michelle Trachtenberg are remembering the actress with touching tributes after her passing on Wednesday at the age of 39.

Michelle Trachtenberg was not interested in wading into the legal waters surrounding her Gossip Girl costar Blake Lively in the weeks before her death. Us Weekly confirmed on Wednesday, February 26, that Trachtenberg was found dead inside her Midtown West Side apartment.

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 paid an emotional tribute to her Gossip Girl co-star Michelle Trachtenberg Wednesday, describing herself as blindsided at the news of her sudden passing at 39. Trachtenberg, who played Lively’s onscreen on-again off-again friend Georgina Sparks on the CW series,

Blake Lively took to her Instagram Stories Wednesday evening to share a lengthy tribute to her “Gossip Girl” costar Michelle Trachtenberg. “This is the first day I met Michelle,” Lively wrote, sharing a photo of her and Trachtenberg on “Gossip Girl.

Blake Lively has issued an emotional tribute to her Gossip Girl costar Michelle Trachtenberg following the actor's tragic death at age 39. Sharing a photo of herself and Michelle on Instagram Stories,