While Scott Disick is busying making out with models and holding hands with Kendall Jenner during the Cannes Film Festival, his on-again/off-again ex Kourtney Kardashian was stuck doing the NBCUniversal Upfront event with sister Khloe in New York City on Monday night. The Big Apple is a blast but not when your baby daddy is having the time of his life with every lady under the sun in the South of France!

For the event, Kourt donned a white satin suit with lace bra top. Sister Khloe opted for a beige suede minidress. We are definitely feeling Khloe's sexy look over the mom-of-three's pantsuit!

The sisters primped at posed at the blue-carpet event as their mother and sister Kendall went to the glittering Chopard event at Porto Canto during Cannes. Oddly enough, Kris and Kendall's male escort was Scott -- who had just been spotted making out with a sexy babe on a yacht. After the bash, Kendall and Scott, who were already too close for comfort, were snapped holding hands. How creepy!

Is it just us -- or does the fact that Kris and Kendall are chilling and illing (and hand holding) with Scott not seem very loyal of them?!