"Just finished my daily basket of focaccia...hbu?" Kourtney captioned the innocuous snapshot of herself eating a bite of savory bread, making a kissy face at the camera and soaking up the sun in a bronze bikini.
"Where are your kids?" asked one commenter.
Clearly not content with just letting the criticism pass unaddressed, Kourtney was quick to shut the shamer down personally.
"My son was taking the photo, and the other two were sitting across from me. Thank you so much for your concern," Kourtney wrote in a reply that received more than 79,000 likes.
The irony of shadily accusing the 39-year-old celeb of being a neglectful mother is that just hours before, she had posted a collection of heartwarming snapshots of her daughter, whose birthday they had just celebrated in the small, coastal Italian vacation destination.
"My little birthday ladybug makes my heart incredibly full every day. So in awe of her," Kourtney captioned the super sweet Instagram slideshow.
Meanwhile, as the eldest Kardashian sister is enjoying family time in Italy, her younger sister, Khloe Kardashian, recently took to Snapchat to lament having to go back to work two months after giving birth to her baby girl, True.
"Tomorrow is my first day back to work," Khloe shared in the video she posted, as her baby gently cooed against her shoulder. "I have missed a feeding here or there with True, but I've never missed multiple feedings in a day, so I have a ton of anxiety."