Michelle Trachtenberg Looks Back on 'Harriet the Spy,' 'Buffy,' 'Gossip Girl' and More! (Exclusive)

From Dawn Summers to Georgina Sparks, Michele Trachtenberg has brought us countless iconic characters over the years! Now the 35-year-old actress is spilling behind-the-scenes moments from her favorite projects, including her time with Rosie O'Donnell on set of the beloved Nickelodeon film, 'Harriet the Spy.' Plus, the star dishes to ET about hosting and executive producing 'Meet, Marry, Murder,' the true crime docuseries premiering Oct. 6 on Tubi.