The snap was uploaded by Bruce's first wife Linda, showing all three happily smiling for the camera.
Bruce married to Chrystie in 1972, but after separating in 1981 he was then married to Linda until 1986. Then in 2013, Bruce and Kris Jenner separated after 22 years of marriage.
The photo comes after former Olympian Bruce, 65, gave a two-hour interview to ABC News on Friday night in which he confirmed ongoing rumours that he is transitioning into a woman.
Linda, who has two children - Brandon and Brody - with Bruce, talked about her former marriage in a blog on The Huffington Post, where she said: "It's impossible for those of us who are comfortable living in our own skin to fully grasp what an imprisonment that must feel like to be born into the wrong body.
"Bruce has already 'gone through the fire'... It is certainly not our place to judge him or others who may feel trapped, ostracised, or alone."
During Bruce's interview last week, he told Diane Sawyer: "For all intents and purposes, I'm a woman. People look at me differently. They see you as this macho male, but my heart and my soul and everything that I do in life - it is part of me. That female side is part of me. That's who I am."
Bruce did not appear as a woman on the interview, but he did show Diane a black dress that he would be wearing to dinner. Bruce's transition will be covered in a as-yet-untitled series to air on E! in the summer.
Both Linda and Chrystie contributed to Bruce's two-hour interview last week, but Keeping Up With The Kardashians star Kris Jenner was absent, and viewers heard interviewer Diane say Kris had declined to comment.
Kris then said via Twitter that nobody had asked her, but ABC have since said that they did approach Kris for comment.
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