New mom of four Michelle Williams has been seen for the first time since expanding her family via surrogate.

Williams was seen with her five-year-old son Hart Kail in Brooklyn on Tuesday, enjoying the last days of summer with visible happiness alongside her young son.

The star, 44, kept her cool in tank top (minus the bra), billowing white trousers, flip flops, and flannel shirt tied around her slender waist. 

The mother-son pair seemed unaccompanied by Williams’ newest family member, her third child with husband Thomas Kail (and her fourth child overall).

For now, the actress enjoyed some quality one-on-one time bonding with her boy.

The doting mom held hands with her child as they took in the city sights with a leisurely stroll.

Michelle Williams, now a mother of four, was photographed for the first time since welcoming a new addition via surrogate, spending a day with her son Hart Kail in Brooklyn on Tuesday.

Williams revealed the arrival of her fourth child – and first born via surrogate – during an appearance on Jimmy Kimmel Live last month.

The news followed after guest host Tiffany Haddish praised Williams on her post-pregnancy physique, leading the actress to attribute her figure to her surrogate’s role.

“I didn’t realize you had three little ones,” Haddish told Williams. “Can I just say that your body looks amazing, because I would have never guessed you had any!”

Williams replied: ‘Then I’ve got to give a big shout out to Christine, cuz this last baby did not come through my body.’

She also hinted at the sex of the newborn.  

‘But the miracle of our little girl is thanks to Christine. Maybe you’re watching out there – thank you, Christine.’

Michelle Williams also has a 19-year-old daughter, Matilda, with the late Oscar-winning actor Heath Ledger, who passed away from an overdose in 2008.

She also shares two young children with her husband, theater director and TV producer Thomas Kail – Hart and a second child born in 2022, whose name has not yet been revealed.

The actress gave another emotional shoutout to her surrogate, adding: ‘Thanks to Christine, I have three under 5 at home.’

Williams kept her cool with a tank top, flowing white trousers, and flannel shirt tied around her svelte waist

It comes several weeks after Williams announced her family had expanded once again

Williams revealed that a surrogate named Christine helped her become a mother-of-four

Williams spoke candidly about balancing motherhood with her Hollywood career, admitting the juggle isn’t easy.

The My Week With Marilyn star told a late-night chat show host: ‘Everything’s good and under control. I’m the adult. I’m trying to figure out the sort of life-work balance.

‘I hear a lot of people are talking about self-care, and I’m just wondering when. Because I’m a working mom. Like, I already have the guilt, and I don’t want to take more time away from them, but I understand, like, I need to fill up the tank.’

As for her rare moments of private time, Williams revealed what she likes to do.

The newborn child did not appear to join Michelle for the outing

Michelle has three children with her husband Thomas Kail and a fourth, daughter Matilda, with her late ex, Heath Ledger

Michelle joked: ‘It’s by visiting our fine local establishments of government bureaucracy.

‘You say, “I’m sorry, honey. But one day you’re going to grow up, and you’re going to get a job. And you’re going to pay taxes, and you’re going to need a Social Security number for that.”‘

Her husband is best known for directing Lin-Manuel Miranda’s smash musicals In the Heights and Hamilton on Broadway and Off-Broadway.

They wed in 2020.