Kylie Jenner is honoring her late grandmother, MJ, with a series of heartfelt Instagram Stories ... sharing treasured family memories just days after the Kardashian-Jenner matriarch's death.

The Kylie Cosmetics founder posted three throwback Stories featuring Mary Jo "MJ" Campbell, including sweet family photos spanning the years. Kylie kept the posts simple, letting the nostalgic snapshots speak for themselves as she remembered her beloved grandmother.

Kylie's tribute comes after Kris Jenner tragically announced Thursday that MJ had died at 91. In an emotional Instagram post, Kris called her mom "the heart of our family" and thanked her for the love and wisdom she shared throughout her life.

MJ was a familiar face to fans of "Keeping Up with the Kardashians" and "The Kardashians," frequently appearing alongside Kris and her famous grandchildren over the years.

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Kylie isn't the only family member paying tribute. Kim Kardashian also shared an emotional message remembering MJ as her "best friend" and "forever twin," saying she spent the last week by her grandmother's side before her death.

MJ's cause of death has not been publicly disclosed, but one thing is clear ... she'll be deeply missed by the Kardashian-Jenner clan.