In her late teens, Evans was engaged to Patrick Curtis, who later became a press agent and married Raquel Welch. Evans has been married and divorced twice. Her first marriage was to actor, photographer, and film director John Derek. They started dating in 1965, married in 1968, and separated on Christmas day 1973, when Derek disclosed his affair with Bo Derek, who was 30 years his junior, and was 17 years old at the time. Evans' second marriage was to Stan Herman, a property executive, from 1975 to 1979. She then lived with restaurant owner George Santo Pietro, from 1980 to 1984. Evans also dated "The Big Valley" castmate Lee Majors for a brief period following her second divorce, as well as businessmen Richard Cohen (an ex-husband of Tina Sinatra) and Dennis Stein (a former fiancé of Elizabeth Taylor) during the mid-1980s. In 1989, Evans began a relationship with new-age musician Yanni, which lasted until 1998. Her best friends are her ex-stepdaughter, television writer Sean Catherine Derek, and Bunky Young, Evans' former assistant, whom she has known since the mid-1960s; both reside near her in Washington state. She is also close with John's Europe-based second wife, Ursula Andress, a sometime houseguest at her home in Beverly Hills.