The actress's rep confirmed to CNN that the 29-year-old starlet and her fiancée, SNL alumn Jason Sudeikis, are expecting their first child together.
While speaking about her future husband to Marie Claire magazine in March, Wilde said she couldn't wait to have children.
"I'm open-minded about how many, but three, which I love, is like a little party. ... (T)here's no strict plan for anything in my life. What happens, happens," she told the magazine, adding that Sudeikis would make a great dad.
"He's so good with kids," she said. "I've never before experienced looking at someone and thinking, 'That's who I want to raise a child with.'"
The Tron star took to Twitter to thank her fans for their good wishes.
WOW. You guys are awesome. So kind. Thank you thank you thank you! PS. Babies eat mostly salsa right?— olivia wilde (@oliviawilde) October 28, 2013
Wilde and Sudeikis got engaged in January of 2013 after 14 months of dating. This will be the actress's second marriage; she had previously tied the knot to Italian filmmaker and musician Tao Ruspoli in 2003. The two divorced in March of 2011.