Actress Michelle Trachtenberg was born on October 11, 1985, in New York City, and made a recognized splash into the Hollywood scene only 11 years later when she starred with Rosie O'Donnell in Harriet the Spy. Before the film, she had commercial and television acting experience, most notably with future Buffy the Vampire Slayer co-star Sarah Michelle Gellar on the soap opera All My Children. After Harriet, Trachtenberg made smaller film appearances, along with additional television roles. In 1999, she co-starred as Penny in Inspector Gadget with Matthew Broderick. She took on the role of Gellar's younger sister on the WB series Buffy the Vampire Slayer in 2001, and a recurring turn as pop star Celeste on Six Feet Under in 2004. She appeared in Ice Princess and Black Christmas. In 2009 she joined the cast of the series Mercy, and continued to work on the big-screen in projects like 17 Again, Cop Out, and Take Me Home Tonight.