And while the comment could have been seen as a sweet sisterly jibe, Kendall took the tweet as trolling, and snapped back at the mum-of-one.
Retweeting her sister, she posted: "You wish b****."
Kendall's swipe isn't the first time she's taken a jibe at one of her sisters.
"Kim made me come to her house and help her pick a name," the 23-year-old explained at the time.
"And it was this whole thing. She would not let me leave the house until we figured out a name, and then ended up going with a name that I didn't even — like, that I didn't care for as much. I think they were all really beautiful, but I was kind of rooting for another name."
WATCH: Kim Kardashian blasts Kendall for hating her son's name
Naturally, the interview struck a nerve with the KKW Beauty founder, and she's since revealed what she really thought of her sister's subtle diss.
"So I saw this interview that Kendall did on Fallon, and I was like, 'Excuse me! First of all, say it to me first; don’t say it on TV," the mum-of-four said.
"No, but I, there’s like a grace period of when you have to name your child before you have to go into the government offices and do the paperwork. Ten days, you got 10 days before you have to name your child or they are named John Doe.
The makeup mogul continued: "We had like an hour. I woke up in the morning and Kanye was really busy working, but I knew our list. So I called my sisters and Kendall was available, so I said 'Come over now, you're not leaving the house until we've got the name.'"
Kim's theory is not that Kendall didn't like the name but that she's salty they didn't go with her suggestion.