The couple is already parents to 2-year-old son Otis.
Congratulations to Olivia Wilde and Jason Sudeikis!
The couple became parents for the second time on Tuesday, as they welcomed their baby girl, Daisy Josephine Sudeikis.
"There goes the neighborhood. Daisy Josephine Sudeikis," Wilde announced alongside the adorable first photo of her baby girl. "Born, like a boss, on #internationaldayofthegirl."
The couple's new daughter joins big brother Otis, 2.
While the couple first announced they were expecting in April, it seems little Otis didn't quite understand his soon-to-be big brother duties.
"He knows that it's something in an egg," Sudeikis said of his son's reaction to the baby news in May. "We just used metaphors in [The Angry Birds Movie to explain it to him]. That's all. We explain everything through the movie."
Otis may have had some catching up to do, but Wilde couldn't have been more ready to welcome her baby girl.
"#tbt summer boat ride with my OG and my any-day-now G. ✌," she adorably captioned a sweet photo of herself and Otis as she neared her due date.
RELATED: Pregnant Olivia Wilde Is Baby Bumpin' in Red -- See Her Glam Maternity Look!
Wilde revealed that she and Sudeikis were expecting a baby girl last month in a politically-charged tweet.
"As someone who is about to have a daughter, this hits me deep in my core," Wilde wrote alongside a video slamming Donald Trump for his comments about women and body image. "#NeverTrump."
See more in the video below.