She wrote: "I look like a normal mum out with baby.
"Stating that I don't eat is pretty much saying I am putting my own vanity before my babies [sic] well being (if I wasn't eating enough how could I have the energy to be looking after him well?)
"It's a backwards way of saying I'm too far up my own arse to care about my son."
She went on: "I don't see any bones sticking out, I see a slim, healthy sized, happy young mum."
Earlier today she posted a picture of herself wearing a dress that belonged to her late mum, Paula Yates. She wrote: "Me in my mum's amazing 50s vintage dress with Astala x"
Peaches gave birth to her son, Astala, four months ago and she and her fiancé Thomas Cohen seem to have adjusted well to parenthood.
As far as we're concerned, Peaches looks happy and healthy - but what do you think?