The couple seemed to be having a great time as they played in the water near a yacht that carried the rest of the family. Older sister Kendall Jenner also got in on the action and seemed to be having a blast.
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Before jetting off to St. Barts, Kylie and Tyga were spotted zip-lining in Mexico during her birthday vacation. During that vacation, they shared other public displays of affection, including cuddling up to each other and holding hands on the beach.
The couple played coy about their relationship, until the 25-year-old rapper confirmed their relationship with an Instagram post in March.