The average breast size has increased from 34B to 36C in the UK due to the rising trend of plastic surgery between the years 1996-2006.
According to lingerie firm La Senza the average bra size in the UK is 36C, whereas 10 years ago most women had a smaller, 34B chest.
Experts say the boom in bust size can be explained by the dramatic rise in the number of women opting for cosmetic surgery implants.
A general change in women's body shapes, which has seen a move towards the fuller figure, is also behind the increased bust-lines.
The research, conducted by La Senza, revealed that sales of bras with DD, E and F cup sizes across their 118 stores nationwide have risen by a third year on year since 2003. In contrast, bras with cup sizes A to D have gone up by just eight per cent.