- An army brat who grew up around the world, Billingsley graduated with honors from Fort Smith Senior High School in Fort Smith, Arkansas in 1958.
- In 1961, newspapers had her romantically linked with both John Strasberg of the Strasberg Actors Studio dynasty, French director Henri-Georges Clouzot, and French actor Pierre Olaf, with whom she starred in the original Broadway cast of the musical Carnival that had opened that year.
- In March 1962, newspapers announced she was going to marry actor Andrew Prine and that she had been replaced in her long-running role in Carnival. However, that May, it was reported that in March, Prine had married actress Sharon Farrell.
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