Keeping Up With the Kardashians, Cruel and Unusual Punishment

Khloé regrets inviting her ex Tristan to their daughter's birthday. Also, Kourtney struggles with turning 40 while Kim receives bad news from her doctor.

Khloé tries to find a way to coexist with Tristan while Kim accuses Kourtney of copying her style, causing a rift between the sisters. Also, Kim's symptoms are diagnosed.

While in Napa, Khloe and Kylie discuss Jordyn's betrayal. Kris pulls the ultimate prank on Kim and Kourtney and Scott receive some unwanted parenting advice.

Khloe plans a birthday trip for her friends Malika and Khadijah but is offended when Malika starts exhibiting diva behavior.

With only days to go before her son's birth, Kim heads to NYC for fashion's biggest night. Back in LA, Kourtney discovers an employee is stealing from her.

To celebrate the birth of Psalm, Kim organizes a special surprise for Kanye. Also, a girls' trip to Turks and Caicos is anything but relaxing for Kourtney and friends.

Khloé considers reconnecting with Lamar following the release of his book. Kris worries an old rumour will spark a fight with Khloe and Kim speaks at the White House.

Kim struggles to disconnect from work on a family trip to Costa Rica. Meanwhile, Khloé faces old insecurities when she attends her first prom.

Kim and Kourtney fight over the theme of North and Penelope's joint birthday party. Kris is concerned about Khloé's obsessive behaviour.

Khloé worries Tristan is trying to win her back. Kim and Kourtney help a local community after learning people are being sickened by toxic waste.

Kim and Khloe are furious that Kourtney is hiding aspects of her life from the cameras, and attempt to fire her from the show.

Kris takes the family to Wyoming in an effort to ease recent tension and strengthen their bond, but her plan backfires when the girls start fighting on the trip.