First of all, as she explains, it's the first time she's ever brought a guy on a family trip and second of all, she's a little nervous because it IS a family trip and she's the only person with a plus one.
As we've seen in a previous sneak peek, she had good reason to be nervous, because her sister Kendall Jenner was really hoping to spend some quality time with Ky and when she finds out Tyga is coming, that obviously throws a wrench into her sisterly bonding plans. Hopefully they're all able to work it out and have a good time together!
**To see more from the family (plus Tyga!) vacay, tune in to KUWTK Sunday at 9 pm on E!**