Kendall Jenner Flashes Toned Tummy In Crop Top While Kylie Showcases Her Pert Derriere As They Prepare To Party

Their family is reality television royalty. And Kendall and Kylie Jenner were the definition of a sister act when they attended a pal's birthday bash in downtown LA on Saturday. The statuesque model, 19, leaned close to Kylie in a snap shared by the 18-year-old, which she captioned 'Idgaf if they were.'