Our favourite is Kendall Jenner's choice. She compiled a collage of pictures of her with Rob, and we love the one of them when they were tots. Too cute!
Kendall said: "a very happy birthday to my amazing big brother @robkardashian!!! love you so much, stud!"
Her big sister Kim Kardashian opted for this snap...
We love that she used a photo in which she took centre stage and Rob's kind of blurred and in the background!
Kim said: "Happy Birthday to my baby bro @robkardashian I love you soooo much!!!!"
Meanwhile, Kourtney Kardashian opted for a super cute photo in which she can be seen giving Rob a major bear hug.
She said: "Happiest of happy birthdays to my little baby brother Roberto. Your soul shines bright. Can't wait to hug you tonight."
Let's hope the birthday boy had fun celebrating his 27th!
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