Michelle Trachtenberg was found in her New York City apartment, and the death is not believed to be suspicious, police said.

Blake Lively, Sarah Michelle Gellar and other stars remembered Trachtenberg’s work ethic and friendship in social media posts.

The "Gossip Girl" and "Harriet the Spy" alum, who rose to fame as a child star, was found dead in New York City on Wednesday, according to police.

Hollywood is mourning actress Michelle Trachtenberg, who died on Wednesday. She was 39. Trachtenberg, best known for roles in "Buffy the Vampire Slayer," "Gossip Girl," Disney's "Ice Princess" and more, is believed to have died of natural causes, police sources told ABC News.

Georgina was played by the actress Michelle Trachtenberg, who was found dead at 39 in her Manhattan apartment on Wednesday. Her performance as the teenage supervillain brought an arch flair to a character who was only a minor figure in the novels that were the basis for the show, but became a fan favorite onscreen.

Michelle Trachtenberg, an actress best known for her roles in "Buffy the Vampire Slayer" and "Gossip Girl," has died at age 39.

Michelle Trachtenberg’s producing partner, Casey Tebo, shared his final conversation with the “Gossip Girl” star before her shocking death. Trachtenberg passed away on Feb. 26 at the age of 39, as The Post exclusively revealed.

Michelle was thrown a lot of curveballs with her health, but she did her best not to let it get her down,” Michelle Trachtenberg's friend said

Michelle Trachtenberg, beloved for her roles in 'Gossip Girl' and 'Ice Princess,' faced numerous health challenges before her untimely death at 39