Photos: Kendall and Kylie Jenner flash little of their toned abs in sexy crop tops as they launch fashion collection

Kendall, 20, and Kylie Jenner, 18, both looked gorgeous flashing their toned waist line as they attended a private dinner to launch their new fashion line at Neiman Marcus on Thursday night.
The sisters wore abs skimming tops for the occasion as they celebrated the #OnlyatNM collection.
More photos below...