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Kylie Jenner, Tyga

TRB/EKNY/FAMEFLYNET PICTURES

Hold on tight!

While on vacation in St. Barts this week, Kylie Jenner and her boyfriend Tyga went on a flyboarding excursion in the ocean together.

The 18-year-old Keeping Up With the Kardashians star and her rapper beau suited up in some safety vests and helmets before jetting up into the air above the Caribbean ocean. The lovebirds flashed giant smiles and looked like they were having the time of their lives during the high-flying activity. Kylie and Tyga even held hands at one point to steady themselves in the air.

Kylie Jenner, Tyga

TRB/EKNY/FAMEFLYNET PICTURES

How cute are these two and their PDA?

Kylie and Tyga were also snapped lounging and cuddling together on a yacht yesterday during their day of fun in the sun.

The duo are currently on a family vacation in St. Barts with Kim Kardashian, Kendall Jenner (who also tried her hand at flyboarding), Khloe Kardashian, Kourtney Kardashian and her adorable kids.

Kendall Jenner

TRB/EKNY/FAMEFLYNET PICTURES

The famous family has been flaunting their super-sexy bikini bodies all week while sightseeing and relaxing in the tropic weather.

The family getaway comes just days after Kylie's big 18th birthday party and subsequent B-day vacation in Mexico.

Kylie Jenner, Tyga

TRB/EKNY/FAMEFLYNET PICTURES