From Wikipedia, the free encyclopedia. Olivia Catherine Hack (born June 16, 1983) is an American actress best known for providing the voice of Rhonda Wellington Lloyd in Nickelodeon's Hey Arnold!, and played Cindy Brady in the 90's theatrical Brady Bunch films. She has also done voices for Fillmore!, Bratz as Cloe, Family Guy, Blood+ and Avatar: The Last Airbender as Ty Lee. She appeared in Star Trek Generations, Party of Five, and Gilmore Girls. She was born in Beverly Hills, California. She w...