In a recent poll on goodtoknow, over half of you have said your boobs are a D cup, or bigger. We've also unearthed some research by underwear store Bravissimo which has discovered that 60% of women who think they're a C cup are actually a D or bigger.
In other words, we're a nation of big-boobed women and we're wearing the wrong underwear!
If you want to avoid the double boob (where the edges of the cups cut into your breasts to create an extra portion of flesh), the underarm boob (where your bra creates a pocket of flab by your armpit) or the back and shoulder grooves (where the bra straps are so tight they leave pink dents in your skin), then read on to find out who to measure your bra size properly.
Bravissimo's Anna Prince tells us how to check your bra fits correctly.
The strap around your body should be firm but comfortable. When you stand side-on to a mirror, the strap that runs around your body should be horizontal and should not ride up at the back at all.
The wires at the front should lie flat against your rib cage and should not dig in, rub or poke out at the front.
Your breasts should be enclosed in the cups and you should have a smooth line where the fabric at the top of the cup ends and meets your bust. You shouldn't have any ridge or bulging over the top or sides of the cups, even if you are wearing a balconette style or lower cut shape.
Where to next?
How to keep your boobs perky
Get your dream body
Cheat's diet tips