Kim & Kourtney Bikini Battle in the Caribbean

4/2/2012 9:30 AM PDT

Kim & Kourtney Kardashian -- Bikini Battle in the Caribbean

It was belly bump vs. booty bump, as bikini-clad Kim and Kourtney Kardashian let all their loveliness hang out while vacationing in the Dominican Republic this weekend.

While pregnant Kourtney flashed her bulging stomach, Kim made sure her posterior pride and joy enjoyed its moment in the sun too.

The Kardashian sisters are always ready for their close-ups.