The proud new mom, 30, took to Twitter to share her happiness about the arrival of her son.
“Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I’m the building),” she wrote, adding a sweet photo of herself cuddling her son.
Wilde, who got engaged to Sudeikis in January 2013, announced her pregnancy back in October, and this January they announced that they were expecting a baby boy.
Olivia Wilde and Jason Sudeikis started dating in November 2011.