Her struggle to get pregnant was widely publicised during her marriage to Lamar Odom.
But now Kim Kardashian has revealed that sister Khloe was actively trying NOT to get pregnant when she realised that her relationship was on the rocks.
Speaking to Jimmy Kimmel, the bride-to-be admitted that her sister had decided against having children with the NBA star - despite previously admitting that she was having IVF treatment.
Kim said: "Khloe wasn't trying to get pregnant. She wasn't showing up to these doctor appointments on purpose and behind our backs because she knew [the marriage] wasn't working.”
The chat show host went on the press Kim about the breakdown of her sister's marriage, and she admitted that she didn't see it coming.
Depsite reports about Lamar's alleged drug abuse and numerous infidelities, Kim admitted that she never thought they'd actually divorce.
She told Jimmy: "I always thought Khloe and Lamar would work out.”
Kim went on the discuss her baby daughter North, admitting that Khloe was the best babysitter out of her whole family, but that brother Rob was the worst.
She said: "Rob is the worst. I wanted him to spend time with her the last day and asked him to babysit for an hour.
“I pretended I had a meeting and he never showed up. Kourtney said it was the worse idea ever.”