Singer Iggy Azalea has admitted she has gone under the knife for breast enhancement.

"I did change something," the singer said when asked by Vogue magazine about what she would change about her body, reports aceshowbiz.com.

"Four months ago, I got bigger b**bs! I'd thought about it my entire life," Azalea added.

The Australian rapper was tired of having padding sewed into her costumes, and she initially wanted to keep the breast augmentation a secret because she didn't want her young female fans feel bad about their bodies.

But then, she said: "I decided I wasn't into secret-keeping."

The "Bounce" hitmaker earlier tried out modelling.

"When I first got to the States, people told me I should think about modelling," she recalled. "So I went to a few agencies, but once they measured my body, they didn't like me anymore."

The agencies told her to lose weight and get a nose job, and it affected her confidence.

"I was looking in the mirror a little differently," she revealed.