The largest breast belongs to Annie Hawkins-Turner (aka Norma Stitz) (USA) who has an under breast measurement of 109.22 cm (43 in) and an around chest-over-nipple measurement of 177.8 cm (70 in).
She currently wears a US size 52I bra, the largest made, but by American bra estimation, her measurements would put her in a 48V bra, which is not manufactured.
Annie says that her record-breaking bust began developing at the age of nine: "I just started growing, and kept right on. I started wearing a bra when I was in third grade, and it was a regular grown-up woman's bra. I don't remember ever wearing a training bra."
She was eventually diagnosed with the rare medical condition breast hypertrophy which is what caused her breasts to grow so large.
The iconic record holder appeared on UK magazine show "This Morning" back in 2011, where she said that each of her breasts weighed about 56 pounds (25 kg).
Annie was advised by doctors to have a breast reduction, but she refused, explaining: “I don’t want to mess with nature. As my breasts grew the muscles in my back developed and supported them."
Having the world's largest breasts does not come without problems. Annie can only drive 4x4 cars and has to be extremely careful when walking down stairs.
However, Annie’s assets have also helped her become a millionaire, travelling the world as a model and self-named "boob-preneur".
Annie, who is a mother with two children, was awarded her Guinness World Records title in 2000.
"It made me feel like a million bucks. It's such an honour. This will go down in history. It's something I will always cherish," she said.