The Kardashian-Jenner women headed to St. Barts during Season 11, episode 6 of E!'s hit series "Keeping Up With the Kardashians." Their relaxing vacation quickly turned tense when Kylie Jenner, the youngest of the bunch, extended an invitation to her rapper boyfriend Tyga

After a rocky flight to their island paradise, the ladies settles into their rooms and prepared for some rest, relaxation and, more importantly, girl time. Kendall Jenner, 20, who had been especially excited to get in some one-on-one time with Kylie, 18, quickly grows upset with the lack of face time she is getting with her younger sister. The tension continues to grow when the young model learns that Kylie invited Tyga, 26, to join in on the trip. Kendall decides not to voice her frustrations to Kylie, instead confiding in sisters Kim, Kourtney and Khloé Kardashian. Mom Kris Jenner defends Kylie's decision, recounting the many times the other Kardashian and Jenner sisters invited boyfriends to join in on family trips without asking. Her anecdote does little to quell Kendall and the Kardashian siblings' frustrations, however. 

Tyga arrives on the island and quickly begins monopolizing much of Kylie's time. The pair skip out on group activities like paddleboarding and hiking to lie around and soak up one another's company. Kendall grows more and more upset, but keeps it to herself. She acknowledges in a one-on-one interview that she likes Tyga as a person, but wishes he hadn't come on the trip.

Although Kendall and Kylie's tiff is the main focus of episode 6, Khloé, 30, and Lamar Odom's tumultuous relationship is also a noteworthy part of the show. During the trip Khloé learns that Lamar Odom, 36, has done an sit-down interview discussing their relationship. In the interview, he claimed he had been told by his estranged wife that she still loves him. He told the publication she was still his wife, adding that he didn't want her to date other men. The interview weighs heavy on Khloé, who has been hard at work trying to move on. She acknowledges that she still does love Lamar and always will, but says he has done little to put any effort into making their relationship work.

"Keeping Up With the Kardashians" airs Sundays at 9 p.m. EST on E!