The 33-year-old actress - who has children Honor, six, and two-year-old Haven, with husband Cash Warren - has stripped off for several magazine shoots and film roles in the past, reported Contactmusic.
"I think a lot of women with children are sexy. It's weird thinking that because you have children you don't have ownership or you can't have sex appeal.
"You don't stop becoming a woman, that's for sure. And it does make me laugh when my name appears in those 'sexiest actress' polls because that is just not who I am. Everyone who knows me well knows that I am a real prude!," she said.
"It is make-believe. I am not naive about the way Hollywood works. I know that sex sells movie tickets. But a good director can make a scene sexy without me taking my top off," she added.