"Seriously too thin," one Facebook comment read that already had 2,009 likes as of Wednesday morning, 6 a.m. PT.
"So I love love love Bethenny but I say this in the nicest way ... she looks thin in an unhealthy way," another comment reads, which had 1,881 likes. "I know she is tiny but compared to like her main pic this pic is a bit concerning."
This of course isn't the first time Frankel has received criticism about her weight.
In July, she caused controversy when she posted a picture of herself on Instagram wearing her four-year-old daughter Bryn's Hello Kitty pajamas.
"This is my daughter's nightgown and PJ shorts. Think we're ready to start sharing clothes yet?" she wrote.
"I'm genuinely excited, with a side of slightly nervous, for my return to The Real Housewives of New York City," the Skinnygirl mogul announced in a statement. "Bravo has always been the place on television where I have the freedom to be unfiltered, honest and inappropriate, with an audience who has been with me from the beginning. I can't wait to see what this next chapter brings for all of us. Watch what happens!"
Do you think Bethenny is too thin? Weigh in by tweeting #ETnow and in our comments section below.