Grace Gummer and Mark Ronson have welcomed their second child.

On Friday, a source close to the daughter of Meryl Streep, 38, and the acclaimed musician, 49 — who wed back in 2021 — told Page Six the couple gave birth to a daughter sometime last week.

The insider also revealed that Ronson is taking serious precaution to keep his newborn healthy.

On Wednesday night, the music producer made a fleeting appearance at his mother Ann Dexter-Jones’ star-studded birthday bash at Clemente Bar — the cocktail lounge owned by his future brother-in-law, celebrity chef Daniel Humm. But he kept his face hidden behind a mask.

Exposing Ronson’s motive, the insider claimed he wore the mask out because ‘he and Grace had a baby five days ago.’

DailyMail.com has reached out to representatives for the couple for comment.

Grace Gummer and Mark Ronson have welcomed their second child; seen September 2024

Gummer is the daughter of Oscar-winner Meryl Streep; Streep seen on February 16 

Ronson’s stepsister — Annabelle Dexter-Jones — and her fiancé Michelin-starred chef Humm, took charge of hosting duties for the stylish soirée that saw various famous faces. 

However, Gummer, 38, was notably not by Ronson’s side — raising eyebrows about her noticeable absence from the family festivities.

The birth of the pair’s little bundle of joy comes just days after the DJ successfully co-produced the SNL50: The Homecoming Concert with Lorne Michaels.

Read More Meryl Streep’s daughter Grace Gummer expecting second child with Mark Ronson

The actress and the Uptown Funk producer exchanged vows in a lavish wedding in August 2021 and welcomed their first child, a daughter named Ruthie, in early 2023. 

During an interview with PEOPLE last year, Ronson got candid about his family life and deep appreciation for his wife and toddler daughter sweetly sharing that they are his ‘anchor.’

‘The most important thing is being around for her, so I’ve never had that — I mean, obviously with my wife too, I love her; I never want to be apart from her for more than a day if I don’t have to be,’ the performer shared.

‘I have to be away sometimes to go write music and do whatever I have to do. But it’s like once you have the child too, it really truly does just become everything that is now the most important thing.’

The pair reportedly met at the Chanel Tribeca Film Festival Artist Dinner in April 2019 and have been inseparable since. 

Prior to their romance, Gummer was briefly wed to actor Tay Strathairn from 2019 to 2020.

The pair were last seen out at Justin Theroux’s Pebble Bar Holiday Party back in mid December 2024

On Friday, a source told Page Six the couple gave birth to a daughter sometime last week; the couple seen in May 2024

Since tying the knot with Gummer in 2021, Ronson has formed a close bond with his mother-in-law Streep, 75; Meryl, Grace and Mark seen September 2022

Ronson had previously tied the know with French star Joséphine de La Baume from 2011 to 2018. 

The Valerie producer has also formed a close bond with his mother-in-law, Hollywood legend Meryl Streep, 75. 

Beyond sharing red carpet moments, the duo took their connection to the spotlight when they teamed up to present an award together at the 2024 Grammys, showing off their strong family ties.

‘I’m really, really honored to be here tonight with you, Mark, to present the most important award of the night, the best album of the year,’ the Devil Wears Prada star quipped before her son-in-law corrected her, noting that they were awarding record of the year.

And at the Golden Globes a few weeks later, Ronson rhapsodized the icon during a brief interview on the red carpet, saying ‘She can do everything.’