Michelle Williams confirmed her fourth child’s arrival while gushing about her “busy” family life.

Four months after Page Six reported the actress and husband Thomas Kail expanded their brood via surrogate, the “Dying for Sex” star told “Jimmy Kimmel Live!” viewers that they welcomed a baby girl.

When guest host Tiffany Haddish praised Williams’ “snapper” figure on Monday, the Emmy winner clarified, “I’ve got to give a big shoutout to Christine because this last baby did not come through my body.”

She added, “The miracle of our little girl is thanks to [my surrogate] Christine. Maybe you’re watching out there. Thank you, Christine.”

The 44-year-old went on to describe having “three under 5 at home,” joking that she is “the adult” and “everything is good and under control.”

Williams and Kail, notably, are the parents of son Hart, 5, and a 2-year-old whose name and sex remain private.

The Golden Globe winner, who is also the mother of 19-year-old daughter Matilda, explained that she is now “really busy trying to figure out the life-work balance … as a working mom.”

She noted, “I already have the guilt, and I don’t want to take more time away from them but understand I need to fill up the tank.”

Williams shared her “pro hack tip” with fellow parents, saying she has “got it all figured out” and practices self care by “visiting local establishments of government bureaucracy.”

The “Dawson’s Creek” alum joked, “I recommend a midday appointment because it’s a little bit more crowded. … [You can] wait in complete silence for at least one hour. There is free seating for all.

“Bring, like, a nail file and a to do list and check, check, check,” she continued. “Then … you are led to a window where you get to have an adult conversation.”

Williams gave rare insight into her parenting style during an “Armchair Expert” podcast experience in May.

The Tony nominee broke down how she “own[s] up to” her mistakes raising Matilda, whom she welcomed with Heath Ledger prior to the actor’s 2008 death.

“It teaches her to apologize and say, ‘Oops, Mommy, I’m sorry,’ and it’s not a big deal,” Williams said. “It’s a part of life, and we move on.”

She and the teenager have “no shame, no blame” in their dynamic.

In 2023, Williams called working motherhood “untenable” and requiring “deep thought and learning and the support of other women.”

She told Entertainment Weekly, “My heart obviously belongs to my children; they tug at it the most. But I really want to be able to have both.”

Prior to her romance with Kail, Williams was married to musician Phil Elverum from 2018 to 2019.