Olivia Wilde, Jason Sudeikis Welcome a Baby Boy

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Olivia Wilde and Jason Sudeikis

The "Her" actress announced the happy news on Twitter.

Olivia Wilde and her fiance, Jason Sudeikis, welcomed their first child Wednesday.

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The Her actress announced the news and her baby boy's name on Twitter, writing: "Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I'm the building)." She also included a black-and-white photo, where she's seen smiling as she holds her son in a blanket. Too adorable.

Wilde, 30, announced her pregnancy in October 2013, and at this year's Golden Globes, she and Sudeikis, 38, revealed they were expecting a boy. 

The couple started dating in 2011 and got engaged in January 2013.