Kim, 33, shared the family portrait, likely taken in the late '80s, in honor of her maternal grandmother's birthday.
"Happy 80th Birthday to my grandma MJ!!!!" she wrote. "You have taught me so much about life! You are my idol!!! I can't wait to celebrate with you!"
The photo shows former model MJ (aka Mary Jo Shannon) and her daughter Kris (who's wearing a shiny jacket and some big, tousled '80s hair), along with Kim and sisters Kourtney and Khloé. The siblings are wearing matching shirts and patterned jackets with brooches, but it's Kim (at the top of the photo) who almost steals the show with her long dark locks and side-swept bangs.
Kim has been spotted out shopping with her grandma in the past and in May, shared a photo on Instagram with MJ, who was visiting Paris for the first time ahead of Kim and Kanye West's romantic wedding.
Kourtney also posted a throwback pic with MJ on Instagram, writing, "This woman has always inspired me so much as a strong, independent, smart woman. Happy birthday MJ!"