Kylie Jenner has NO FEAR when it comes to diving in with Tyga — the couple did some extreme hand holding down in St. Barts.

We’re downplaying … but this actually looks like one of the cooler things they’ve done since going all PDA after her 18th birthday.

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Tyga and Kylie went flyboarding during the family vacay on the Caribbean island– and it looks like they’re nailing it already.

The flyboarding, that is.