(Photo by Frazer Harrison/Getty Images)Several co-stars of the late Michelle Trachtenberg have come forward to pay tribute to the actress who passed away this week at the age of 39.What did Sarah Michelle Gellar and Blake Lively say about Michelle Trachtenberg?Taking to social media, Sarah Michelle Gellar — who starred in Buffy the Vampire Slayer along Trachtenberg — shared a series of photos of the pair, including one with actress Shannen Doherty, who passed away last year. View this post on Instagram A post shared by Sarah Michelle (@sarahmgellar)Blake Lively, who starred alongside Trachtenberg in the hit series Gossip Girl, shared a photo of the pair from the show along with a lengthy message about the late actress. Lively called Trachtenberg “a kind person, through and through,” praising her for always being kind and herself at all times.Other stars that worked with Trachtenberg, including Buffy the Vampire Slayer co-stars James Marsters, Alyson Hannigan, and Clare Kramer, also took to social media to share tributes to the actress. View this post on Instagram A post shared by James Marsters (@realjamesmarsters) View this post on Instagram A post shared by Alyson Hannigan Denisof (@alysonhannigan) View this post on Instagram A post shared by Clare Kramer (@clarekramerofficial)According to reports on Trachtenberg’s passing, the actress was found by her mother on Wednesday in her New York City apartment. The actress did recently undergo a liver transplant, according to ABC News, but no official cause of death has been disclosed as of yet.The post Sarah Michelle Gellar, Blake Lively & More Pay Tribute to Michelle Trachtenberg appeared first on ComingSoon.net - Movie Trailers, TV & Streaming News, and More.