Earlier this month, model and campaigner Iskra Lawrence revealed to her 4.2 million Instagram followers that she is expecting her first child with boyfriend Philip Payne.

The 29-year-old posted the announcement on November 5, writing: "It’s not just the two of us anymore, we're soon to be a family of 3". (The heartwarming post then suddenly turns into an #ad for a brand of pregnancy tests - which was a little bizarre.)

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Sadly, being in the limelight, the model's pregnancy was never going to be without criticism, and now Lawrence has had to bring out her mama bear claws and take a rude commenter down a peg or two.

Always one to keep her social media followers updated, the British model shared a picture to Instagram on Friday showing off her growing baby bump. The body-positive campaigner proudly displayed her changing body in a gorgeous bra and underwear comb - but one commenter sadly soured the moment.

Check out Iskra's recent four-month bump reveal:

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The picture in question was a pregnancy throwback pic and showed Iskra holding a blueberry to represent the size of "baby P" at seven weeks. She captioned the pic: "I've been keeping track ever since I found out I was pregnant. So here's the first throwback to 7weeks when baby P was only the size of a lil blueberry [sic]".

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However, Lawrence wanted to make it clear that she was also thinking about those women who are currently experiencing fertility issues - as some may find the pregnancy posts "triggering". She wrote: "I want to take this time to celebrate all women and their journeys and highlight the normalities of infertility and bring awareness to issues that [affect] 1 in 4 women.

"You are not alone and you and your body are worthy of love and celebration too."

A wonderful message, I'm sure we'd all agree. However, one commenter decided to leave a rather unsavory comment on the post, causing the model to hit back.

Taking to the comment section, the body-shamer wrote: "I would have fixed the vag before posting."

Replying to the commenter, Iskra - who famously takes pride in only sharing untouched pictures - said: "It doesn't need 'fixing'. All my body parts are perfectly wonderful thanks and I refuse to retouch them."

Iskra Lawrence sends an important message on the NYC subway:

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Many of Iskra's fans praised her for the honest response. "[There's] absolutely nothing to fix anywhere. @iskra is just beautiful", one fan wrote.

"[Thanks] for shutting down that horrible comment. We dont wish for what kind of body we want [sic]", addressed another.

A third commented: "I think its horrible how people tall down on what a 'perfect or normal' vag is suppose to be. I think there should be something out there to help young woman accept and be comfortable with their private parts. So i applaud you and love that you shut it down [sic]".

Pregnant Iskra Lawrence shuts down body shamer who commented on her privates