Kendall had her nipple piercing on full display while Kourt came close to suffering a wardrobe malfunction in her halterneck look
With no kids in sight, the sisters have well and truly let their hair down this week.
After enjoying some fun in the sun aboard their luxury yacht, the pair headed inland on Wednesday to grab a sweet treat.
Dressed for a night on the tiles rather than a quick trip to the ice cream parlour, yummy mummy Kourt was daring to bare in a halterneck black top.
The top was so flimsy she risked a serious wardrobe malfunction as she was followed by cameras into the local eaterie.
The 38-year-old, whose younger lover Younes was nowhere to be seen, wore the top with a pair of high-waisted leather shorts, red strappy heels and Matrix-esque style shades.
Sister Kendall was only slightly more laid back opting to wear a completely see-through white crop top and a pair of print trousers.
At this point, Kourtney had no doubt caught wind of the news that her trouble maker ex Scott Disick had also flown into Cannes with his new lady friend Bella Thorne.
Scott, 33, and former Disney star Bella, 19, were spotted kissing and canoodling in the sunshine on Wednesday in a very amorous display.
The dad-of-three was snapped fondling her cleavage as they relaxed on a sun lounger.