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Kendall Jenner, Kylie Jenner, Tyga

Jason Merritt/Getty Images; Araya Diaz/WireImage

On last night's episode of Keeping Up With the Kardashians, Tyga crashed the "girls' trip" to St. Barts and Kendall Jenner certainly wasn't happy that Kylie Jenner invited her boyfriend without telling anyone beforehand.

Making the sister drama even more intense was the fact that prior to the trip, Kylie ditched Kendall while they were spending quality time with Caitlyn Jenner at the racing track.

So is Kendall and Kylie's relationship still on the rocks?

"It's not rocky," Kim Kardashian recently told E! News exclusively, adding of the vacation drama, "We just thought it was a girls vacation."

Kylie Jenner, Tyga, GIF, KUWTK

E!

"When Kylie showed up, because she came like a day later, Kendall was so excited for them to spend time together and Kylie brought her boyfriend, she just didn't know about it," Saint West's mama added. "Kendall had all this stuff planned and then it was like, ‘Oh there goes my girls trip.' She was just so excited to spend quality time with Kylie and just had she been prepared it would've been a different story. I felt bad for Kendall, kinda."

When Kendall found out Tyga was joining the trip during Sunday's episode, the model wasn't shy about letting everyone know how "annoying'' the situation was. "I was really looking forward to being with Kylie on this trip," she said. "Not that I don't love Tyga, but having him around kind of takes Kylie away from me. I don't think spending time with me is very important to her."

Glad to hear the sisters' relationship is back on track!

Watch Keeping Up With the Kardashians Sunday at 9 p.m., only on E!