According to sources who spoke to The Post, Michelle Trachtenberg, the former child actress who starred in a variety of TV and movie shows, such as “Buffy the Vampire Slayer” and “Gossip Girl,” passed away at the age of 39. According to the sources, Trachtenberg’s mother discovered her in One Columbus Place, a 51-story upscale … Continue reading Former “Gossip Girl” And “Harriet the Spy” Star Michelle Trachtenberg Passed Away At The Age Of 39 After Undergoing A Liver Transplant.