While the savage banter between the pair is not out of character, some fans did express disappointment in Kourtney for being so blunt and judgemental, regardless of being unaware of the pregnancy. Especially in light of Khloé's recent admission that the famous family told her to lose weight because she was "hurting the brand."
"Sooo mean," wrote one fan. "Let her eat in peace."
"Even if she wasn't pregnant it was pretty rude," said another.
"Leave Khloe alone! She’s beautiful!" wrote another. "I thought that was so rude,"
However, plenty of fans found humour in the exchange and took to Kourtney's Instagram post to tag their own sisters.
"Talk between sisters🙈😂" wrote one.
"This will be you before I announce I’m pregnant," said another.
What do you think of the exchange? Let us know in the comments!