Olivia Hack (born June 16, 1983) is an American voice actress and comedienne, best known for providing to be replacing the recently departed Devyn Puett (1992-1993 and 1995 cameo voice actress) for providing the voice of Rhonda Wellington Lloyd in Nickelodeon's "Hey Arnold!", and played Cindy Brady in the 1995-1996 theatrical "Brady Bunch" films. She has also done voices for "Fillmore!", "Bratz" as Cloe, "Family Guy", "Blood+", "" as Ty Lee, and "Open Season 2" as Charlene. She appeared in "Star Trek Generations", "Party of Five", and "Gilmore Girls". She was born in Beverly Hills, California.