A FITNESS-loving Instagram star has shocked social media by posting enviable bikini snaps while nine months pregnant.

Model

Given her incredibly toned tum, you’d never guess that model Sarah Stage was ready to pop.

The 33-year-old, from LA, posed for a saucy selfie in a bright red bikini.

She proudly held her tiny bump, which is barely visible in the image.

Unsurprisingly, Sarah’s followers were very surprised by the mum’s appearance.

One of Sarah’s followers remarked: “How this is possible amazes me! I look like I’ve eaten a watermelon haha! Xx”

Other fans also waded into the debate.

On Instagrammer said: “I have this cute bikini….

“9 months pregnant and you still look better then I do not pregnant at all lol!!! Love you girl!!!”

Another added: “9 months pregnant! I look like his after dinner!”

While many were supportive of the fitness fanatic, others worried that she could be doing harm to her unborn child.

One critic said: “I’m a nurse & you are so scary… dieting & extreme exercises…I hope you & your baby are normal after what you put your body through!”

Another even advised Sarah to seek medical attention, remarking:“Please see a therapist soon for your children’s sake”.

This social media storm follows many others sparked by Sarah.

It comes just months after she previously stunned social media with snaps showing her almost flat abs when she was five months pregnant.

The new arrival will be the second baby for the LA model and partner Kris Jason, parents to two-year-old James, TheSun learnt.

In 2015, she appeared on Good Morning America to defend the tiny bump in her first pregnancy and her gruelling fitness regime against critics who claimed she was putting her baby at risk.

She said: “I don’t know how someone could say something like that to a pregnant woman.

“I think that is so rude. My baby is healthy and we are happy.”