The 44-year-old British actress spoke about her chest size at the recent Directors Guild of America Awards.
She said to UsMagazine.com: 'Today I'm wearing huge breasts. No, it's a corset. They're still real - if you get a proper corset.'
Carter has two children - Billy, seven, and Nell, three - with her longterm partner Tim Burton and said the corset fooled people into thinking her breasts are bigger than they are.
She said: 'It's amazing what a corset will do. I'm not all that well-endowed. These are my Golden Globes. Who needs Golden Globes when you've got these?'