Olivia Wilde and Jason Sudeikis are expecting their first child.
The couple, who got engaged in January, are "very excited" to be preparing to welcome a baby into the world next year.
A source close to the couple told People.com: "They are incredibly happy. They're very excited to welcome a new member into their family."
A spokesperson for the couple also confirmed the news.
The 29-year-old actress first met the 38-year-old actor on the season finale of Saturday Night Live in 2011 and they began dating six months later.
Earlier this year, Olivia gushed about her desire to start a family with her fiance and hinted they want lots of children.
She said: "He's so good with kids. I'm open-minded about how many, but three is like a little party."
The Rush actress is set to wed the We're The Millers star in New York City next spring.
The former House star was previously married to Italian prince Tao Ruspoli for eight years until 2011, while Jason was married to Kay Cannon for six years until 2010.