Brown emigrated to Australia in the 1970s and became a familiar figure on Australian television, with appearances on Graham Kennedy's Blankety Blanks, Jimmy Hannan's Celebrity Squares plus ongoing roles in soap operas Number 96 (in 1977), and Network Ten's E Street (in 1990–1991) and various advertisements. She had a guest role in the Australian-filmed revival of Mission: Impossible (1988). Film roles in Australia included The Return of Captain Invincible (1983) and Welcome to Woop Woop (1997).
Chelsea guested on BBC television comedy Sketch show "The Two Ronnies" on 16 September 1972 singing The Carpenters song "Let Me Be the One". Chelsea met and became engaged to Australian Property Developer Kel Hirst whilst holidaying in Acapulco, Mexico in 1973. Chelsea moved to Australia shortly after that, Kel became her manager and they were married in 1977. They divorced in the early 1980s. Kel features as the male vocal on Chelsea's record "Day Dreaming" (October 1975).
Brown was born as Lois Brown in Chicago, Illinois to Mildred and Edward Brown. She appeared in a segment of a first-season episode of Love, American Style titled "Love and the Militant", with fellow Laugh-In alumnus Stu Gilliam. Other guest roles included appearances in Marcus Welby, M.D., Ironside, Matt Lincoln, Match Game (in 1974) and, in the UK, The Two Ronnies. She also appeared in the films Sweet Charity (1969), Dial Hot Line (1970) and The Thing with Two Heads (1972).
In the mid 1990s she was married to fellow E Street actor Vic Rooney, who died in 2002, after which she returned to the United States.
Brown died in her hometown of Chicago, Illinois, March 27, 2017 at the age of 74, from pneumonia.
