- Became the first American Bond Girl when she took on the role of Tiffany Case in Diamonds Are Forever (1971).
- In same ballet class as youngster with Natalie Wood and Stefanie Powers; the three women all later had long-term relationships with Robert Wagner.
- She and Lana Wood have been at odds since 1971, more than a decade before Natalie's death. The feud started when Sean Connery was dating Lana and Jill simultaneously.
- She and husband Robert Wagner have homes in Aspen and L.A.'s Pacific Palisades where Jill keeps a number of horses.
- With an IQ of 162, she studied at UCLA starting at the age of 14, leaving after two years when she signed with Universal Pictures.
- Recently sold her Brentwood ranchette, that she shares with Robert Wagner for a reported $14 million. The couple had resided there since 1983. (August 26, 2007)
- Co-star in Diamonds Are Forever (1971) was Lana Wood, whose sister, actress Natalie Wood had been married to her future husband Robert Wagner. In 1999, she refused to be photographed with Lana for a Bond girl reunion for Vanity Fair magazine, so she was photographed separately and superimposed with the rest of the Bond girls.
- Marriage to Wagner has lasted longer than all six of their previous marriages combined. He was divorced twice and widowered once, while St. John was divorced three times.
- She is skilled in the use of guns and can handle a sports car like a professional racing driver.
- Originally was considered for the minor role of Plenty O'Toole in Diamonds Are Forever (1971); however, after the producers saw her, they offered her the lead. Naturally, she accepted.
- Was replaced by Sharon Tate for the role of Sarah Shagal in The Fearless Vampire Killers (1967).
- In the 1980s, her fantasy was to downhill ski faster than any Olympic team.
- Former daughter-in-law of Woolworth heiress, Barbara Hutton.
- Injured in a skiing accident and required hospitalization. (February 5, 2005)
- Jill and Robert Wagner officially became an item on Valentine's Day 1982. They met in 1959.
- Dated musician Bill Hudson of The Hudson Brothers; Atlantic Records president Ahmet Ertegun; songwriter Sammy Cahn; singer Trini López; director Roman Polanski; talk show host David Frost; football player Joe Namath; baseball player Sandy Koufax; lawyer Sid Korshak; plastic surgeon Steven Zax; screenwriter Tom Mankiewicz; former U.S. secretary of state Henry Kissinger; UN secretary general U Thant; Texas lieutenant governor Ben Barnes; Italian jewelry czar Gianni Bulgari; racehorse industry executive Ogden Mills Phipps; fashion designer Oleg Cassini; producers Robert Evans, Jack Haley Jr. and David L. Wolper; actors Michael Caine, Barry Coe, Sean Connery, Glenn Ford, Peter Lawford, George Lazenby, George Montgomery, Jack Nicholson, Hugh O'Brian, Alejandro Rey, Tom Selleck, Robert Vaughn and Adam West; criminal court judge Jerome M. Becker; investment broker Lenny Ross; ski instructor Ricky Head; Chicago businessman Delbert W. Coleman; Brazilian entrepreneur Francisco "Baby" Pignatari; automobile racing manager Count Giovanni Volpi di Misurata; and Olympic ski champion Brownie Barnes. She was engaged to Miami real estate developer Robert Blum in 1974, but called off the engagement. She also had a long though intermittent relationship with Frank Sinatra (25 years her senior), whose daughter Tina Sinatra was once engaged to St. John's future husband Robert Wagner.
- Favorite state in the US is Colorado.
- Despite their divorce and subsequent remarriages, she often refers to Lance Reventlow as "my late husband" in interviews.
- Made a fortune buying property and turning it over for a profit.
- Has an IQ of 162.
- Her stage mother changed Jill's last name from Oppenheim to St. John when Jill was 13 and later gave her daughter a turned-up nose job so she would photograph better.
- Has known her husband Robert Wagner since she was 18 years old.
- Has lived in Hollywood, Paris, London, Aspen and Honolulu.
- Her favorite films of her career are Come Blow Your Horn (1963) and Tony Rome (1967), both starring Frank Sinatra.
- Her idol is Kay Kendall.
- It took her German Shepherd "Larry" approximately four months to bark. When Larry did, Jill and Robert Wagner jumped out of their skin.
- One of two actresses (the other is Kim Basinger) to appear in both a live-action Batman production and a James Bond film. St. John appeared in the pilot for the Batman (1966) TV series with Adam West and in Diamonds Are Forever (1971).
- Once appeared in a production of "Annie Get Your Gun" at age 11.
- Once ran the designer-sweater business Smith-St. John Ltd.
- Taught her stepdaughter Courtney Wagner how to ski.
- She and her husband, Robert Wagner, have appeared in seven movies together: Banning (1967), How I Spent My Summer Vacation (1967), Around the World in 80 Days (1989), The Player (1992), Something to Believe In (1998), The Calling (2002) and Northpole (2014).
- She and Wagner spend their recreational time skiing, horseback riding and golfing.
- If she were not an actress, she would be a marine biologist.
- Was given the nickname 'magic' by her husband Robert Wagner.
- Has a cat named Terminator.
- 1958 Deb Star.
- Virtually retired from the screen by 1986, but her marriage, and the resulting connection to a high-profile homicide case, keeps her name in circulation.
- In 2006, Jill became a step-grandmother when Katie Wagner gave birth to a son: Riley John Lewis Wagner.
- Friends with fellow former Bond girl Luciana Paluzzi, celebrity chef Giada De Laurentiis and actress Melanie Griffith. Was quite close to the late Barbara Sinatra.
- Ran unsuccessfully in 2023 for a board seat on the Aspen Fire Department.
- Contrary to persistent internet claims, she's not Jewish -- at least not practicingly so.
- Was originally cast as the princess in Day of the Assassin (1979), but bowed out when her deposit failed to arrive on time. Susana Dosamantes replaced her.
- Married Lance Reventlow at the Mark Hopkins Hotel in San Francisco.
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