- Had a brief romance with Elvis Presley, her co-star in It Happened at the World's Fair (1963).
- After retiring due to a stormy personal life, she settled down and successfully raised two children while running a management firm for the Hilton Hotel chain.
- Has two children, Russell (by guitarist Billy Strange) and Melissa Anne (by NBC executive Jack Meyers).
- As of 2015, was living in Auburn, CA.
- 1953 Deb Star.
- After her acting career ended, O'Brien sang with the Harry James band in 1968. Almost a decade earlier, she had sung with the Lawrence Welk Orchestra and performed as a soloist for composer Buddy Bregman at the Moulin Rouge night club in Los Angeles.
- Of French and Irish ancestry.
- Graduated from Chaffey Union High School in Ontario, California.
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