Khloe Kardashian did something very un-celebrity and actually owned up to her mistake Friday when she apologized to fans who pointed out her offensive use of the words "retard" and "retarded" in her Instagram Livestory with sis Kourtney.

The sisters were streaming video of their morning workout, attempting to connect their phones to an exercise app and they both used the word "retarded" as if it were nothing. Khloe said to Kourt, "Yes, you can you f—— retard." She later said, "Are you f—— retarded?"

Very poor choice of words, Khlo -- fortunately a fan called her out, saying "If True had a disability, you would use a different word." KK replied, "Ugh I hate that word! Why did I even say that? You are a million percent right and I actually greatly dislike when people use that word! I will do better! I am sorry! much love today." At least she admitted it!