The largest natural breasts on a woman have a chest-over-nipple measurement of 70 inches. This record belongs to Annie Hawkins-Turner, a New York native.
It's important to note that this measurement refers to the circumference of the breasts. The size of breasts is typically measured by bra size, which combines a band size (chest circumference) and a cup size (the difference between chest circumference and bust circumference). Annie Hawkins-Turner has worn sizes such as 52I and even larger custom sizes.
While cosmetic surgery can alter breast size significantly, the Guinness World Record specifically recognizes the largest natural breasts.