Once again proving she's been hitting the gym hard, Khloe, 31, wore a figure-hugging black dress that left little to the imagination with its thigh-high slit and her side boob in plain view.
Kendall's style was just as skimpy. Also showing a lot of leg, the 19-year-old model paired a printed bikini top with a matching thigh-baring skirt and gladiator sandals. Kendall took a hair tip from her younger sister Kylie Jenner and sported some cornrows.
Khloe and Kendall's older sisters, Kim and Kourtney Kardashian, were not seen on the ATVs but they still turned heads with their St. Barts styles. Kim, 34, flaunted her baby bump in a skin-tight, black maxi dress that she dressed up with red lipstick and big gold bracelets.
Kourtney, 36, and the ladies' mother, Kris Jenner, sported more loose-fitting ensembles, but like Kendall, they also rocked gladiator sandals. Kourtney wore a short, white frock and red lipstick for the family outing. Meanwhile, momager Kris, 59, chose a blue printed dress that, again like Kendall and Khloe, showcased a lot of leg.
Kendall and Kylie have admitted that they do take style cues from their older siblings, and that certainly was evident during the first day of the family's vacation in St. Barts. "Growing up around them and they are pretty stylish... we learn from them," Kendall confessed to ET.