Olivia Wilde and Jason Sudeikis Welcome Baby Girl

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. 

WATCH: EXCLUSIVE: Jason Sudeikis on Having More Kids: 'We Did a Humdinger of a Job on the One We Got'

"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."

RELATED: Olivia Wilde Says Son Otis Is Already a 'Little Feminist', Gets Candid About Breastfeeding Photoshoot

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.