The Kardashian-Jenner family is currently living it up in St. Barth, and on Wednesday Kylie and Kendall Jenner hit the sea on a pair of jet skis, and the girls clearly had a blast.

Kendall hopped on her own wave runner while Kylie rode tandem with boyfriend Tyga, and Kourtney Kardashian and son Mason even got in on the action for a few minutes. Kendall seemed pretty confident zipping around, but Kylie looked a bit scared. Either that or she was worried about getting her hair stuck in her lip gloss...

Of course, before Kylie got wet and wild on the water, she struck a pose in this snakeskin-print bikini, which she clearly matched to her $900 custom Converse pumps. Seems like a more natural environment for the cosmetically-enhanced starlet, who turned 18 earlier this month. "Anaconda," she captioned the pic. Now that she's legal, you know Tyga's anaconda is getting some of this...