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She posted a throwback photograph of Caitlyn prior to her transition from a man to a woman in 2015. In the image, Caitlyn - dressed in a silk robe - holds a glass of champagne while sitting on the edge of a bathtub where former wife Kris is appears to be nude and covered in bubbles, reports people.co.uk.
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Others shared the photograph on Twitter, asking: "Is this Kim throwing shade at Caitlyn or is it just me?"
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Although Kim publicly supported Caitlyn's transition, she cut ties after reading her book "Secrets of My Life", which reportedly stated that Kris knew more about her gender identity crisis than she has admitted.