The image shows Katherine Webb, a former Miss Alabama, holding her eight-month-old son Tripp in her arms, while she takes the photo in the bathroom mirror.
“The only time butt dimples are cute #bathtimebaby,” she captioned the image.
The post received hundreds of comments and prompted a heated debate on the social media site, with many Instagram users accusing the 27-year-old model of body shaming.
One user wrote: “many people have butt dimples that’s nothing to be ashamed of. Every body is beautiful. Stop encouraging body shaming!”
Other users disagreed and thought that the model, and wife of Cincinnati Bengals quarterback AJ McCarron, had just made a harmless cheeky little joke.
One person commented: “I heard people were being salty on here so even though I don’t follow you I just wanted to say ignore them. I took the same pic of both my girls bc they’re just delicious little beings at this stage! Go give that adorable little man of yours some extra kisses.”
“I don’t get the issue… cmon people, don’t you have anything else better to do?” added another.