Kylie & Kendall Jenner -- Working on Their Kardashian Tan

With Kim, Khloe and Kourtney nowhere to be found, Kris Jenner's youngest daughters Kylie, 14, and Kendall, 16, enjoyed having the spotlight and some bikini tanning time in Hawaii on Wednesday.

Kylie and Kendall know keeping up with the Kardashian glow takes work.