Kourtney and Khloe had some problems to deal with in a Keeping Up with the Kardashians season 9 episode!

As reported by Breathe Cast, Kourtney is allegedly jealous of her sister, Khloe. Kourtney's boyfriend, Scott Disick has been seen spending time with Kourtney's little sister, more than usual.

A source for the Keeping Up with the Kardashians season 9 stars said:

"Everyone knows that Khloe and Scott are practically best friends, but Kourt is starting to get irritated by the amount of time they're spending together."

Kourtney has two children with Disick, and they're expected to expand the family, more likely by December.

The source further said:

"The whole situation has irked Kourtney. Maybe it's the pregnancy hormones, but she's politely asked Khloe to back off and give them some room. Needless to say, it's causing no end of stress for the sisters,"

The two Kardashian sisters and Disick are working on their new show, "Kourtney & Khloe Take the Hamptons." The show will feature the sisters living in The Hamptons, and working at the family store, "Dash," in New York City.

No details have been disclosed yet if Khloe has stopped getting too close on Disick, in lieu of her sister's request.

A controversial photo of Khloe and Disick emerged in social media. A Twitter photo last July 21 showed Khloe and Disick enjoying some playful time together in the bathtub, with a tweet saying:

"Looks like @KhloeKardashian has a new bath buddy! --> https://on.vh1.com/1k8rLUC,"

Meanwhile, Khloe's current boyfriend is rapper, French Montana. She separated from husband Lamar Odon, a former NBA player.

Watch this situation unfold in Keeping Up with the Kardashians season 9 episodes!