Tomos Morgan wrote on Facebook: "When you're both like... You have no respect".
Arianna Elle wrote: "You're a mother, think about the message you're sending to young girls out there and what example you're setting for your own kids. Grow up and get some class!"
Others meanwhile supported her decision.
Kiesha QueenVirgo Mason wrote: "Some women feel empowered being naked some feel empowered being fully clothed. I think she's beautiful with a beautiful body that most women with children wish they could have after a baby, and she's allowed to love herself and her body and share it with the world if she wants to."
Ratajkowski first got into the limelight after flaunting her body in Robin Thicke's controversial music video Blurred Lines.
A model and actress, Ratajkowski had roles in hit flicks Gone Girl and We are Your Friends, starring alongside Zac Efron.
The 24-year-old also posted the image on her Twitter account adding: "However sexual our bodies may be, we need to have the freedom as women to choose when & how we express our sexuality."
Kardashian made headlines this month when she shared a nude selfie with her 62.4 million Instagram fans.
The image also attracted a flood of criticism for the reality television star, including heavyweight celebrity Chloe Grace Moretz.
Legendary entertainer Bette Midler also took aim at Kardashian tweeting "If Kim wants us to see a part of her we've never seen, she is going to have to swallow the camera".
- nzherald.co.nz
