The lip kit mogul poses in her Calvin Klein lounge pants as she lifts her hip off the ground in the picture.
"Weekends in @calvinklein#mycalvins #ad," she commented on the sponsored post.
The elasticated waistband snatches in at her waist while the pockets of the trousers emphasise the curve of her hips.
But fans suggested that her hourglass figure wasn't all natural and may have been digitally altered.
"What's up with your hip?" one fan commented.
"Did you dislocate your hip or something?" another concerned fan wrote.
"What's wrong with your right hip? It protrudes at an odd angle," another comment read.
It's not the first time one of the Kardashian clan has been accused of photo editing this week.
Just days ago Kylie's older sister Khloe Kardashian was told she looked "too skinny" in her own Calvin Klein sponsored post.
The mum-of-one ias modelling her pink Calvin Klein pyjamas in the snap where her slim midriff was left
Posing with her mermaid-like candyfloss hair hanging loose over her shoulders, Khloe looked ethereal in the stunning shoot.
But trolls took to the comments to suggest that the pictures are "unreal".
"Photoshopped?" one fan asked.
"Khloe why so skinny?" another commented.
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