Olivia Wilde and fiancé Jason Sudeikis welcomed their new baby boy, Otis Alexander, on Wednesday.

Wilde took to Twitter to announce the birth of her new son to the world. She wrote, “Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I'm the building)”, alongside a black-and-white photo of the newborn cuddling up to her, reports The Huffington Post.

Wilde, 30, and Sudeikis, 38, have been dating since 2011 and announced their engagement in January 2013. They announced the pregnancy of their first child, baby Otis, nine months later.

“I just thought, 'Oh, I'm going to hide this forever. But I ended up getting kind of excited to show the bump, as a badge of pride,” the House actress told Lucky magazine, for its May issue.

"I'm a woman! Look at me making a human! I am a goddess!" she went on to say.

In an interview with Marie Claire last year, Wilde said that she and Sudeikis were looking forward to expanding their family, noting that three kids would be like “a little party”.