Actress Sienna Miller has confessed that squeezing into sexy corsets for her new movie Casanova gave a boost to her breasts, something she never realised she had.

The British actress, who earlier claimed that she tried to get rid of the painfully tight girdles by setting them on fire, as they were very uncomfortable, has now said that she was happy wearing them, after feeling the impact they had on her assets.

"I got to wear corsets in the movie. They are so romantic, they look fantastic, although they are agony. They squeeze you to within an inch of your life," the Sun quoted the blonde actress, as saying.

"I loved the cleavage, though. I never realised I had breasts until the movie," she added.

Sienna plays the role of independant Francesca, who gives her legendary lover a run for his money in the romantic comedy, Casanova, starring Heath Ledger in the title role.