It's the battle of the post-pregnancy bodies as two mums slug it out to define what they think is the most desirable shape after giving birth.
Last month, we reported how super-fit mum-of-three Maria Kang had caused uproar when she was accused of 'fat-shaming' after she posted shots of her lean and toned body in workout gear online.
Now 35-year-old Australian mother Taryn Brumfitt – herself an internet hit for sharing nude photos of her softer, rounder post-baby body online – has written an open letter to Maria saying 'looking perfect isn't all it's cracked up to be'.
She added that the Californian mum's firm, trim look is impossible to sustain without enormous sacrifices – including not being able to devote enough time to your children.
And she should know - for in a reversal of the traditional 'before' and 'after' shots which invariably show the subject looking better after, mum-of-three Taryn shared a picture of herself looking super-toned in a bikini, posing in a fitness competition she entered to show the amount of hard work it takes to create the 'perfect body' after you've had babies.
In the second photo she is sitting naked, one year later and 20lbs heavier, less firm, with a rounder tummy. The post was viewed 3.6 million times.
She wrote: "Here is my non-traditional before and after photo...I just wanted to share with you that I loved my body on the stage, prancing around in a bikini as much as I loved my body sitting butt [sic] in my girlfriend's studio.
"Our bodies will go through many changes in our life. Our bodies change through ageing, pregnancy, illness, weight loss, weight gain, the list goes on. One thing we must learn to do is love our bodies, before, during and after..."