Olivia Wilde and Jason Sudeikis Olivia Wilde and Jason Sudeikis

Olivia Wilde and Jason Sudeikis will be planning for more than just their upcoming wedding. The couple are expecting their first child together,People reports.

"They are incredibly happy," a source close to the pair tells People. "They're very excited to welcome a new member into their family."

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Wilde, 29, and Sudeikis, 38, met in 2011 when Wilde made a cameo onSaturday Night Live. They took their relationship public in 2012 and announced their engagement in 2013.

Wilde tweeted Sunday: "WOW. You guys are awesome. So kind. Thank you thank you thank you! PS. Babies eat mostly salsa right?"