"I am so excited to see Tyga," Kylie says. "I love having T around. I feel like he just keeps me sane, and he always does everything that I want to do and we love going on adventures."
Kylie then runs into Tyga's arms when they meet up, squealing, "Yay!"
The over-the-top reaction is especially surprising given that the two spent time together in Mexico just days before the Kardashian trip to St. Barts in August.
"This is the first time I'm bringing a guy on a family trip, so I'm a little nervous about how it's gonna go," Kylie later admits.
And now we know not everyone was happy with Tyga's presence during the Kardashian family vacay -- specifically, Kylie's older sister, 20-year-old Kendall Jenner.
"You could have taken this time to be with your family," Kendall chastises her younger sister in another preview for the upcoming episode. "I was really looking forward to this trip to hang out with you."