Kendall Jenner, 18, appears to be sipping champagne while Kylie, 16, sticks to water at sister Khloe's 30th birthday bash

The night may have belonged to Khloe, but little sisters Kendall and Kylie Jenner had some fun
moments too at this rollicking boat party.

Kendall, who's all of 18, fit right in with this merry crowd aboard a yacht in New York to celebrate
Khloe turning the big 3-0 on Friday.

Indeed, Kendall may have caused a few double takes as well as she relaxed on a top deck and sipped what looked like bubbling champagne.