According to TMZ, the 18-year-old just went to the tropical island for moral support — she's not actually in the video.
While there, she posted a pic to Snapchat of her lying in what is said to be Tyga's bed with the caption, "Kingston," but it's reported that they're really "just friends," and nothing went down.
Kylie's moved on to another rapper, PartyNextDoor, but the site reports that she still communicates with Tyga constantly through text and even goes over to his house pretty often.
Watch Kylie talk about being the ultimate trendsetter in the BET Breaks video, above.
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(Photos from left: Dimitrios Kambouris/Getty Images, Larry Busacca/Getty Images)