In a letter, which was originally published by Vogue in September 2016, the Spice Girl turned fashion designer, 42, admitted her regret over going under the knife and also scolded herself for denying it.
“Learn to embrace your imperfections," she writes. "That is what I want to tell you. Let your skin breathe – wear less make-up (and don’t ever let that make-up artist shave your eyebrows! The effects will last forever)."
She continued: “And I should probably say, don’t mess with your boobs. All those years I denied it – stupid. A sign of insecurity. Just celebrate what you’ve got.”
The mum-of-four was always coy about whether she had been under the knife and only discussed it a few times.
The first time she mentioned it was in a 2011 interview with Vogue when she said: “No torpedo bazookas, either. Gone,” – before quickly changing the subject.
And the second time was in 2014 with Allure Magazine when she said of an old photo showing her with more prominent boobs: “I don’t have them any more. I think I may have purchased them.”
And the style icon predicted she will have "so much fun" with her outfit choices over the years, although she will not realise some ensembles will be "ridiculous" and will leave her looking like a "drag queen".
She explained: "You are going to have so much fun with your clothes - PVC catsuits; chokers that say absurd things; weird spiky blonde hair. It will never occur to you that you appear ridiculous. You will turn up at awards ceremonies resembling a drag queen.
“You will always be addicted to Elnett hairspray but you will tone it down. Less of the ‘Hello! I just got stuck in a wind tunnel’, please.”