Olivia Catherine Hack (born June 16, 1983) is an American actress, best known for providing the voice of Ty Lee in Nickelodeon's ' and Rhonda Wellington Lloyd in Hey Arnold!. She is also known for playing Cindy Brady in the 1990s theatrical Brady Bunch films. Olivia has also done voice work for Fillmore!, Bratz as Cloe, Family Guy and Blood+. She appeared in Star Trek Generations, Party of Five and Gilmore Girls.
Olivia Catherine Hack was born June 16, 1983. Her mother, Mia, is an actress and a playwright, and her father is an animation director. As a child actress, Hack appeared in her first commercial for Minolta when she was eight months old. She continued to work in commercials, including a series of national advertisements for McDonald's. She also sometimes worked as a model or acted in stage plays, but she found herself drawn primarily to television and film acting.
Hack's first major acting roles were as Jean-Luc Picard's child in 1994's Star Trek Generations and in 1995 as Cindy Brady in The Brady Bunch Movie. Entertainment Weekly noted the authenticity of Hack's reprisal of Cindy in the 1990s Brady Bunch films, and the New York Daily News made positive comparisons of Hack's work to that of Susan Olsen's Cindy from the original television series.
In 2000 and 2001, Hack received Young Artist Awards nominations for 'Best Performance in a Voice-Over: TV/Film/Video' for her work in the series Hey Arnold!
In 2001, she played teenage M.E. on the show Any Day Now until it ended in 2002.