Sheyla Hershey officially holds the world record for the largest breasts. She had breast implants to increase her breast size to a 38kkk. The plastic surgery is borderline shocking for most. Despite the fact that Sheyla Hershey's breasts are comically huge after her boob job, she still looks rather normal. Most women who get insanely large breast implants end up looking like freaks. She still looks pretty good.