Khloe Kardashian says sisters Kim and Kourtney are 'really making' her think about the 'three kid rule'

Khloe Kardashian in New York City on Monday, May 15, 2017. ((2017 NBCUniversal Media, LLC))

Khloé Kardashian wants to keep up with Kim and Kourtney.

“So I don’t get what’s happening there — after three kids is there a secret rule that moms get hotter?” the youngest of the three sisters commented on Kim’s Instagram photo.

Khloé, 33, who gave birth to her first child, daughter True, this spring, also got back to work Friday with her Good American denim collaboration, according to her Instagram story. But it looks like babies might still be on the “Revenge Body” host’s mind.

“You and Kourt are really making me think about the three kid rule,” she said.

Kourtney, 38, is mom to Mason, 8, Penelope, 5, and Reign 3, with ex-boyfriend Scott Disick. Meanwhile, Kim, 37, is mom to North, 5, Saint, 3, and Chicago, whom she welcomed via surrogate in January with husband Kanye West.

Khloé gave birth to True in April, days after the baby’s father, NBA player Tristan Thompson, was caught up in a dramatic cheating scandal.

This article originally appeared on Page Six.