Rob posted the sweet snap after he celebrated Father's Day (which was on Sunday in the US) with Kanye.
Kim, who has four children with Kanye - North, 6, Saint, 3, Chicago, 1, and one-month-old baby Psalm - shared snaps of her family to her Instagram, along with a sweet tribute to Kanye to recognised the special day.
"Happy Fathers Day! You are the best daddy to our kids!!! We love you so much," Kim posted, alongside photos of the family at the beach together.
The proud mum went on to post a pic of Saint and Psalm, captioning the shot: "My boys."