The 33-year-old also said that she did not understand why people doubt her marriage with her fiance, reported Contactmusic.
"People ask me every day if I'm getting married. I'm like, 'I'm engaged, of course I'm getting married'!" she said.
The couple have a 20-month-old daughter, Maxwell, and six-month-old son, Ace, and believes he is the perfect man for her because they have already been through a lot together.
"He's put up with me and all my hormones for the two and a half years that I've been pregnant. He has seen me at my absolute worst but he hasn't gone far away," she said.
Simpson revealed she has yet to set a date for her upcoming wedding. The actress and her fiance have postponed their nuptials twice since getting engaged in November 2010.