The reality TV star said she decided to boost her natural breasts to a 32GG because she was tired of having to wear push-up bras to achieve her desired look.
She told GMTV host Lorraine Kelly: "You know what, I’ll tell you the honest truth - because I did have quite big boobs, natural big boobs and, as any woman with big boobs knows, they don’t stay pert and firm forever - they don’t.
"And of course, when gravity takes it toll, you’re left with boobs that really only look good in a push up bra - which is what mine had become. And I’d got to a point where I was like, I want them to look like this all the time, I don’t want to have to keep pushing them up."
The 29-year-old added that she had told the surgeon that she "didn’t want them to be ridiculous".
She previously criticised rival Katie Price for having a surgically-enhanced chest.