Hollywood is paying tribute to Michelle Trachtenberg. The actor who starred in 'Harriet the Spy,' 'Buffy the Vampire Slayer' and 'Gossip Girl' died at 39.

O’Donnell was Trachtenberg’s A-list co-star in Harriet the Spy, the 1996 kids movie that marked Trachtenberg’s first major film role (she was just 10 when filming began). O’Donnell played “Ole Golly,” a nanny and mentor to Harriet, the precocious snoop and writer played by Trachtenberg.

News of Michelle Trachtenberg’s tragic death on Feb. 26 at the age of 39 is bound to hit fans of Harriet the Spy particularly hard. The actress was just 10 years old when she made her film debut in the 1996 movie based on the beloved 1964 children’s novel,