The 28-year-old posted a throwback pic of brother-in-law Kanye West holding his daughter North West, but there's no caption!
The photo is an adorable father-daughter moment as Kanye kisses little Nori's cheek, and so it doesn't really need one, though Rob's sister Kim gave it a meaningful one when she first shared it in June.
Kim posted it before she revealed that she and Kanye are expecting a baby boy, and she captioned the sweet shot, "I'm so lucky to be married to a man who is so in love with his daughter, your bond is so irreplaceable! Thank you for being such a good dad! We love and appreciate you so much! We're so blessed to have you!"
Rob only has a few photos on his Instagram, making this appear to be a large gesture of love.
But let's not forget, the reality star has posted family pics before. He has since deleted a cute photo of his niece Penelope Disick, which he captioned on July 17, "Hey P‼ Lol she think she so cool… I LOVE HER!!"
In fact, she told ET why she cropped her now 2-year-old daughter out of a selfie of a picture in December of last year.
"Her eyes were closed and we had taken so many pictures and I happened to like that picture of myself, so I cropped her out," Kim told ET. "All my friends were sitting there and we're like 'It's fine, it's fine.' Everyone crops people, and I got so much crap for cropping her out."