Now it can be revealed that Kylie Jenner invited her boyfriend Tyga to a family vacation last August without the permission of her sisters. A recent report claimed that Kendall Jenner was upset with her younger sibling as the rapper ruined their "sister vibe."

In a report by The Hollywood Life, the recent Kardashian family's luxury trip to St. Barths in August got intense after Kendall Jenner felt upset with Kylie Jenner for bringing along Tyga.

A source said that Kendall Jenner, whose modelling career continues to rise this year, wanted to spend the vacation with her younger sister.

"Kendall misses having quality time with Kylie and had hoped they would get to have some one-on-one time in St. Barths, that's why she was so upset that Kylie invited Tyga," the source dished out.

The report also revealed that Kylie Jenner did not tell her other sisters that Tyga will be joining them on their getaway.

"It's not the same when it's just the sisters. He ruins the sister vibe. Kendall was also bummed out that it was a surprise. Kylie never ever even asked if everyone was ok with her inviting Tyga. It was inconsiderate."

According to the source, Kylie Jenner and rapper Tyga are already together every day, so there is no need to tag him along on a supposed exclusive family gathering.

In a preview clip for the season premiere of "Keeping Up with the Kardashians," Kendall Jenner was seen telleing her younger sister, "I was really looking forward to this trip to hang out with you."

However, Kylie Jenner's response was not shown.

Meanwhile, Kylie Jenner and 25-year-old Tyga opened up about their relationship in a Q&A with the couple in Kylie's app.

The reality star and the rapper, who have been in a relationship for almost a year now, said that they still have disagreements. However, they do not turn these into fights, Mirror UK said.

"We disagree sometimes, but we don't really fight," the "Stimulated" rapper said.

 "If we get mad at each other, we just start laughing," Kylie Jenner added.