The real name of her father is Peter Ingolia, and Connie adopted his stage name of Stevens as hers. Her parents were divorced and she lived with grandparents. At eight, she started attending Catholic boarding schools.
Coming from a musical family, she formed a singing group called The Foremost, the other three vocalists went on to fame as The Lettermen. In 1953, Stevens moved to Los Angeles, California, with her father. When she was sixteen, she started another singing group, The Three Debs. She enrolled at a professional school, sang professionally and appeared in local repertory theater.
Stevens started working as a movie extra. Then, after appearing in four B movies, Jerry Lewis saw her in Dragstrip Riot and cast her in Rock-A-Bye-Baby. Soon after that, she signed a contract with Warner Bros.
She played Cricket Blake in the popular Television detective series Hawaiian Eye from 1959 to 1962, a role that made her famous, and she starred in Warner Bros. feature motion pictures like Susan Slade.
Her first album was titled Conchetta (1958). She had minor hits with the songs Blame It On My Youth, Looking For A Boy, and Spring Is Here. After making several appearances on the Warner Bros. hit TV series 77 Sunset Strip, she recorded the hit novelty song Kookie, Kookie, Lend Me Your Comb, a duet with one of the shows stars, Edd Burns. She also recorded the number 1 hit single Sixteen Reasons (1961). Other releases were Why'd You Wanna Make Me Cry?, Mr. Songwriter, and Now That You've Gone.
Stevens felt she should be given a raise in 1962, and during the dispute with the studio she was placed on suspension. She was also angered over being denied a chance to audition for the lead in the upcoming Warner Bros. musical My Fair Lady . The differences between her and Warner Bros. were patched up long enough, however, for her to star as Wendy Conway in the TV sitcom Wendy And Me (1964-1965) with George Burns, who also produced the show.
She is the mother of actress Joely Fisher and actress Tricia Leigh Fisher.
In the 1970s, Stevens started singing the Ace Is The Place theme song on Ace Hardware TV commercials in Southern California, was a guest on the Dean Martin Celebrity Roast a few times, had a regular role on the 1986 TV series Rowdies, and appeared numerous times on the Bob Hope USO specials, including his Christmas Show from the Persian Gulf 1988.
Among her charitable works, she founded the Windfeather project to award scholarships to Native American Indians. In 1991, Stevens received the Lady of Humanities Award from Shriners Hospital and the Humanitarian of the Year Award by the Sons of Italy in Washington, DC.
In 1994, she issued her first recording in several years, Tradition: A Family at Christmas, along with her two daughters.