The Kardashian-Jenner clan may be enjoying a luxe Summer vacation in St. Barts, but the reality TV stars never steer far from the spotlight. On Tuesday, Kourtney Kardashian continued her sexy bikini streak [2], sharing a gorgeous photo of herself flaunting her ridiculously toned body by the pool. The reality star stuns in a green and white two-piece [3], accessorized with a matching headpiece. The mother of three captioned the photo, "Troop Beverly Hills." A few minutes before, Kourtney's supermodel sister, Kendall, also posted a racy snap of herself lying on a bed in an olive cutout swimsuit, captioned, "Photo booth."

But the selfies didn't stop there. Leave it to Kylie, who turned 18 on Aug. 10 [5], to shut it down with a steamy photo of herself in a revealing red outfit, flaunting serious side-boob. Kylie followed her sisters's short caption trend, writing, "Red."

The Keeping Up With the Kardashians stars have only been in St. Barts for a short time, but they have already taken the tropical island by storm [7]. The crew promptly hit the town [8] and wasted no time getting in on the vacation fun, hopping on ATVs on Monday to go four-wheeling around town. The next day, North West and Penelope Disick joined in on the antics [9] and played dress up with a "real" mermaid.