The 'Rush' actress, who is set to wed the 'We're The Millers' star in New York next spring, has revealed she can't wait to have children with him in the near future.
The 29-year-old beauty told the October issue of Allure magazine that she has no doubt he will be a hands on dad, adding: "Jason is fantastic with children."
The former 'House' star, who was previously married to Italian prince Tao Ruspoli for eight years, also opened up about how she pursued Jason, 37, at the beginning of their relationship because he never asked her for her phone number.
She said: "I met Jason, and I thought he was so charming. He's a great dancer and I'm a sucker for great dancers. But he didn't even get my number.
"Over the next six months we kept running into each other. [One night], my best guy friend walked up to him and said, 'This is Olivia's number. Use it.' That was the beginning."
The couple's wedding is "slowly developing" and Olivia wants it to be a "funny, silly wedding" but above all she hopes they can keep the event private.
She added: "I trust everyone to not leak any information. I just hope no one ends up flying a stupid helicopter over it or anything dumb like that."