In the next episode of Keeping Up With The Kardashians, mother of two Kourtney Kardashian gets jealous when her boyfriend Scott Disick showers her pregnant sister, Kim Kardashian, with attention.

In the preview below, Disick, 30, takes Kim, 32, out to lunch to help her feel better about being pregnant, which she describes as "disgusting." Disick tells his unofficial sister-in-law that because she is expecting, she needs to lighten her mood and "live it up."

In another scene, in an attempt to cheer up Kim, Kris Jenner reveals that after she gave birth to Kourtney, her desire for sex increased.

Later, drama unfolds in the Kardashian home when Disick helps Kim decorate her daughter North West's nursery. Kourtney, 34, reveals her jealousy when she tells Disick,"I love how you don't do this at our house."

When Kris Jenner defends Disick, her oldest daughter tells her to stay out of it. The Kardashian matriarch then fires back, "You gonna get mad at me because I'm giving advice? You had 100 nannies!"

Khloe Kardashian, Kendall Jenner and Kylie Jenner look on as Kourtney hurls an expletive at their mother and storms out of the room.

Kourtney has two children, Mason 3, and Penelope, 1, with Disick. Penelope had her first birthday on July 9.

Kim gave birth to her daughter North West on June 15. She has been keeping a low profile while caring for her newborn since. She broke her Twitter silence to wish her niece a happy birthday on July 9.

"Hope my little Peep had the best 1st birthday today," Kim tweeted.

The seventh episode of Keeping Up With The Kardashians Season 8 will air on Sunday, July 14 at 8 p.m. EST/7 Central.

Watch the preview trailer for Season 8's Episode 7 at E! Online below.

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