Kellie Pickler had breast implants right after American Idol. The plastic surgery dramatically increased her breast size. But, she lost a bit of her innocent country girl charm. The cosmetic surgery may have hurt her public appearance a bit.
Personally I don't think the singer should have had breast augmentation. A boob job is great for some people, while others not so much. America loved the spunky / innocent Kellie Pickler. But, she made the choice to get breast augmentation and stuck with it. There's a big difference in the Kellie Pickler before and after photos.