In August 2008, the former New Look shop assistant from Chichester, West Sussex, was unveiled as the latest face - and body - of Wonderbra lingerie, a position previously held by Czech beauty Eva Herzigova and burlesque star Dita Von Teese.
Later Ultimo underwear owner Michelle Mone enlisted Katie as their new spokesmodel.
During the shoot, Katie had been asked to stuff her bra (as she often did) using a silicone rubber prosthetic, known as a chicken fillet. The photos had also been airbrushed and manipulated to give her a perfect, symmetrical appearance.
And the model admitted it was partly looking at these manipulated images that made her want to seek medical help.
"I might have appeared perfect on the underwear boxes but every time I glanced down, I saw a baggy bra cup on one side," the Daily Mail quoted her as saying.
"If I wore a bra that fitted my smaller breast, the straps would cut into my skin which was painful. I wished I could wake up in the morning and look as good as I did in the photos," she added.
Katie was unwilling to have breast implants. Instead, she opted for a new minimally invasive treatment known as platelet injection fat transfer ( PIFT), first developed to reconstruct the breasts after a mastectomy.
Katie, who has gone on to model for lingerie company La Senza and became the face of Special K breakfast cereal, said she did not undergo the treatment for her career.
"Honestly, my chest was the one thing I disliked about my body. I did it for me. For the first time ever, I have matching breasts as well as thinner thighs. But best of all, I've chucked away my chicken fillets," she said.
Post Title → Exclusive:One of my breasts was B-cup and the other was D: Katie Green