Fans were quick to take to the comment section to express their concern.
"You look very thin. Not trying to be rude. It's just out of concern," one fan wrote.
Another exoressed their worry, writing: "You have lost so much weight hope your ok."
Another fan commented: "Honey your too skinny now stop it."
Back in July Sobinoff was accused of photoshopping images from a recent magazine photoshoot after she appeared slimmer than usual.
The MAFS alum shared photos from the Australian shoot to her Instagram page.
But not long after posting the shots, where the reality TV darling is seen smiling and posing in a blue bikini, she came under fire from fans for allegedly altering the images.
In an attempt to shut down the negative trolling, Lizzie posted a comeback to her Instagram stories.
"Someone said my in my last post was photoshopped! [sic] Um no, take a look, laughable! Yes there would [be] brightening techniques but no sweetheart," Lizzie responded.