"Ladies and gentlemen, Otis Alexander Sudeikis has LEFT the building! (I'm the building)," Wilde tweeted from her personal account along with an adorable picture cradling her son.
Olivia couldn't be more excited to be a mom and despite joking on Twitter during her pregnancy: "Baby brain is real. I should not be permitted to operate heavy equipment including iPhones", the new mom enjoyed the past nine months and even referred to her bump as a "badge of pride."
In the May issue of Lucky magazine, the 30-year-old shared: "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!'"
The Drinking Buddies actress went on to say being pregnant also brought her "into this sort of commune—you feel connected to women in a way that you never have."
Now that the baby is here, next on the couple's agenda is to tie the knot but it's not something the actress feels rushed to do. In fact, she already feels married. Wilde tells the mag: "I'm such a believer in marriage and I think of him as my husband anyway."
Sudeikis and Wilde first announced they were expecting back in October. The couple began dating in December 2011 and announced their engagement January 2013.
This article originally appeared on Usmagazine.com: Olivia Wilde Gives Birth to Son Otis Alexander Sudeikis, Welcomes First Child With Jason Sudeikis