First baby for Olivia Wilde and Jason Sudeikis has arrived!

Olivia Wilde became a mommy! And it's a BOY!

The actress and her fiance Jason Sudeikis welcomed their first child together, baby boy Otis Alexander Sudeikis, on Wednesday.

“Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I’m the building)”, Olivia Wilde tweeted from her personal account along with an adorable picture cradling her son.

The new mom enjoyed the past nine months and even referred to her bump as a “badge of pride”.

“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, like, ‘I’m a woman! Look at me making a human! I am a goddess!’”, she said.

“I’m such a believer in marriage and I think of Jason as my husband anyway”.

The couple began dating in December 2011 and announced their engagement in January 2013.