Lily Rabe and her long-time partner, actor Hamish Linklater, welcomed a third child together.
On Fathers Day, Rabe, 39, captioned a sweet black-and-white Instagram photo of Linklater, 45, with their newborn.
Linklater is holding the baby while its head is just out of the shot in the photo.
The celebrity couple did not disclose the baby''s name, sex, or when she gave birth.
The actress and the Midnight Mass actor have been dating since 2013, and are already parents to a daughter born in 2017 and a second child born in June 2020.
Rabe announced the birth of her first child on International Womens Day, expressing concern about her second child, through Instagram.
The notoriously private couple have yet to reveal their names.
Linklater has a 15-year-old daughter, Lucinda Rose, who has not been married.
In September 2021, a rep for Rabe confirmed her third pregnancy to Page Six shortly after the beauty debuted her baby bump on the red carpet at the Academy Museum of Motion Pictures Opening Gala.
Last December, the mother of three was last seen out on the road walking the red carpet at a screening of her film, The Tender Bar, at the Museum of Modern Art in New York City.
The actor was dressed in a hot pink gown with embroidered flowers on its bell-shaped sleeves.
Rabe and Linklater are collaborating on more than just children, as the pair is planning to co-direct an adaptation of author Chuck Klostermans Downtown Owl, which stars Rabe, Vanessa Hudgens, and Ed Harris, according to Deadline reports.