Meryl Streep is a first-time grandmother after daughter Mamie Gummer gives birth

Congrats are in order for Meryl Streep!

The Mamma Gramma Mia star is officially a first-time grandmother after her eldest daughter, Mamie Gummer, gave birth to her first child with fiance Mehar Sethi, Us Weekly reports.

The outlet reports that the newborn is a boy.

News broke last December that Gummer, 35, was expecting, just a few months after Sethi proposed during their vacation in Croatia.

In addition to Gummer, Streep also shares three other children -- Henry, 39, Grace, 32, and Louisa, 27 -- with husband Don Gummer.

Congrats to the happy family!

In more baby news, Andy Cohen appears to be loving fatherhood after welcoming his first child, son Benjamin, via surrogate earlier this month.

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Meryl Streep and daughter Mamie Gummer
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Meryl Streep and daughter Mamie Gummer
BEVERLY HILLS, CA - FEBRUARY 21: Actor Mamie Gummer (L) and honoree Meryl Streep attend The 19th CDGA (Costume Designers Guild Awards) with Presenting Sponsor LACOSTE at The Beverly Hilton Hotel on February 21, 2017 in Beverly Hills, California. (Photo by Christopher Polk/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 21: Actor Mamie Gummer (L) and honoree Meryl Streep attend The 19th CDGA (Costume Designers Guild Awards) with Presenting Sponsor LACOSTE at The Beverly Hilton Hotel on February 21, 2017 in Beverly Hills, California. (Photo by Christopher Polk/Getty Images)
NEW YORK, NY - NOVEMBER 20: Actresses Mamie Gummer (L) and Meryl Streep attend the Citymeals-On-Wheels Power Lunch for Women held at The Plaza Hotel on November 20, 2015 in New York City. (Photo by Brent N. Clarke/FilmMagic)
NEW YORK, NY - NOVEMBER 20: (L-R) Actress Meryl Streep, executive director, Citymeals-On-Wheels Beth Shapiro and actress Mamie Gummer attend the Citymeals-On-Wheels Power Lunch for Women held at The Plaza Hotel on November 20, 2015 in New York City. (Photo by Brent N. Clarke/FilmMagic)
NEW YORK, NY - NOVEMBER 20: Mamie Gummer and Meryl Streep attend the 29th Annual Citymeals-On-Wheels Power Lunch For Women at The Plaza Hotel on November 20, 2015 in New York City. (Photo by Gary Gershoff/WireImage)
Mamie Gummer, Rick Springfield and Meryl Streep attend the 'Ricki and the Flash' world premiere in New York City. �� LAN (Photo by Lars Niki/Corbis via Getty Images)
NEW YORK, NY - AUGUST 03: (L-R) Mamie Gummer, Rick Springfield and Meryl Streep arrive at the New York premiere of 'Ricki And The Flash' at AMC Lincoln Square Theater on August 3, 2015 in New York City. (Photo by Debra L Rothenberg/Getty Images)
NEW YORK, NY - AUGUST 02: Meryl Streep, Rick Springfield, and Mamie Gummer attend the 'Ricki And The Flash' cast photo call at Ritz Carlton Hotel on August 2, 2015 in New York City. (Photo by Grant Lamos IV/FilmMagic)
NEW YORK, NY - DECEMBER 13: Mamie Gummer, Grace Gummer, and Louisa Gummer, daughters of Meryl Streep attend the 'The Iron Lady' New York premiere at the Ziegfeld Theater on December 13, 2011 in New York City. (Photo by Taylor Hill/FilmMagic)
Mamie Gummer, Meryl Streep and Grace Gummer attend Gilt Groupe and Quintessentially Host Focus Features' TAKING WOODSTOCK Premiere and After-Party at Landmark's Sunshine Cinema & Bowery Hotel on July 29, 2009 in New York City. (Photo by Chance Yeh/Patrick McMullan via Getty Images)
Meryl Streep, nominee Best Actress in a Leading Role for 'The Devil Wears Prada,' and daughter Mamie Gummer (Photo by Jeff Kravitz/FilmMagic, Inc)
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