Khloé invites her ex to True's first birthday party, but an uncomfortable confrontation leaves her questioning her decision. Khloé decides to throw Kourtney a birthday party.

Khloé must figure out how to coexist with her ex. Kim accuses Kourtney of copying her style, causing a rift between the sisters on the eve of Kourtney's big birthday celebration.

Kourtney and Scott approach the family for parenting advice, but some unwelcome input from Corey leads to a blowout argument between him and Scott. Khloe plans a wine-tasting trip to Napa to check in with Kylie and see how her sister is handling some significant life changes. The family is fed up with Kim's new intense security protocol, so they take matters into their own hands.

Scott feels pressure to make sure both Kourtney and his girlfriend Sofia are happy on a family trip to Finland. When North gets an opportunity to star in a video with one of her idols, Kim worries that her daughter will have performance anxiety. Khloe plans a birthday trip for her friends Malika and Khadijah but is offended when Malika starts exhibiting diva behavior.

Kim gives the world an intimate look into the busiest week of her life as she prepares for the birth of her fourth baby, stars in a music video with Paris Hilton, and heads to the Met Gala. Kourtney feels violated when she realizes someone close to her family has been stealing from her.

After the birth of her son Psalm, Kim plans a surprise vow renewal ceremony for her husband to celebrate five years of marriage. When Kourtney's friends can't get along on a girls trip to Turks and Caicos, she must assert herself in order to salvage the vacation. After hearing wild stories about past trips, Khloe is nervous to join Kourtney and her friends in Turks.

When Khloe's ex-husband Lamar releases a memoir that includes details about their relationship, she considers reconnecting with him for the first time in years. After an old rumor resurfaces, Kris worries that it will spark a fight between her and Khloe. Kim is nervous to speak at a live press conference at the White House. Scott thinks his dog has what it takes to win Best in Show.

Kris is furious when some slanderous rumors circulate on the 25th anniversary of her best friend's cuddle. Kim struggles to disconnect from work while on a trip to Costa Rica for her daughter's birthday. Some of Khloe's past insecurities resurface when she attends her first prom.

Kim and Kourtney plan a joint birthday party for their daughters, but a disagreement over candy puts the special day in jeopardy. Kris is concerned about some of Khloe's obsessive behavior and enlists the help of a professional. After receiving criticism over the name of her shapewear line, Kim faces a difficult decision about the future of her company.

When Tristan starts showering Khloe with gifts, she worries his grand gestures are an effort to win her back. After Kim and Kourtney learn that people are being sickened by toxic waste in a nearby community, they vow to help. Kris gives Khloe an unforgettable birthday present.

Kim and Khloe are furious that Kourtney is hiding aspects of her life from the cameras and attempt to fire her from the show; Kim helps a young man recently out of prison with his future.

Kris takes the family to Wyoming to ease recent tensions and strengthen their bonds, but her plan backfires when the girls start fighting on the trip; Kendall is excited to spend some much-needed bonding time with Kylie.