Hang in there, KoKo!
We wouldn't think much of it if it was just a pic, but the reality star added the short caption, "Melancholy."
It has to be a stressful time for the entire family right now, but we know how close the two youngest Kardashian siblings have always been. Kris Jenner recently revealed that Rob actually lives with Khloé, so we bet the news of her baby brother's illness has really hit the 31-year-old hard.
It's not all bad news, though, as this type of diabetes can be treated with a proper diet and exercise program to get the illness into remission and the sufferer back to a good state of health.
We're sure the family will rally around Rob to get him the help he needs!
Rooting for you guys!