Rob Kardashian Makes Rare Social Media Appearance for Sister Khloé’s Birthday

Khloé Kardashian just turned 39 years old on Tuesday, and the celebratory occasion led her younger brother, Rob Kardashian, 36, to return to social media with a special tribute.

Rob, who last posted on Instagram for his father's birthday in late February, took to the popular social media app to post a couple of photos starring his sister Khloé.

The first photo was of himself and Khloé, while the second was a sweet snap of his sister and her niece Dream–Rob's 6-year-old daughter with ex-girlfriend Blac Chyna.

Rob wrote in the caption, "Happy Birthday @khloekardashian 🎈🎈🎈🎈🎈Wishing you nothing but good health and happiness forever my darling buttercup ! I love you so much and so thankful to have u in my life and for all that U do for Dream and I. I don’t know what I would do without you 🤞🤞🤞💙😍💘💘🍹🍹😛🏄‍♂️🍻🥵🥰🏆🧚‍♀️🦈🎾💪😈 happy birthday 🎈🎁🎂🎉."

>>> Sign up for Parade's Daily newsletter and get the scoop on the latest TV news and celebrity interviews delivered right to your inbox <<<

Khloé wrote back to Rob in the comments, "My baby!!!! My favorite human being in the world. You’re my heart beat."

Family friend Malika Haqq replied, "Fraternal twins 😍😍," referencing how close the two Kardashian siblings are.

Many fans loved seeing the sibling bond on display, with some also sharing their happiness at getting an update from Rob and knowing that he's doing okay.

"This is so beautiful. What a bond!" said one fan, while another commented, "Ah how beautiful. I just love ❤️ these two brother and sister. They are my absolute favourite ❤️."

"I miss Rob on the show..he's hysterical and at times the voice of reason," wrote a third.

While Rob slowly left the spotlight during Keeping Up With the Kardashians, he is not involved at all with the new Hulu series, The Kardashians, wanting to keep his life, and that of his daughter, out of the public eye.

Next: The Making of an Empire: All About the Kardashian Kids