The 'Blonde' actress, who will be turning 40 next year, said she has worked hard to get to the milestone, reported Contactmusic.
"When I turn 40 on February 22, I'm going to heave a huge sigh of relief. I'm so happy to be there. I really am. You work so hard to get there, and it's just awesome," she said.
The 39-year-old star also can't wait for her eldest daughter to get a little older, so she can inherit her favourite designer shoes.
"I can't wait until Olive can fit into my high heels. I have a wonderful shoe collection, but none of them fit since I had the girls.