Meryl Streep Has A Secret Third Daughter And She's Starring In HBO's "The Gilded Age"

Okay, so we know that Meryl Streep has at least two daughters, Mamie Gummer and Grace Gummer.

  Dimitrios Kambouris / Getty Images
Dimitrios Kambouris / Getty Images

They are easy to identify because the Meryl genes are strong in them.

  Desiree Navarro / WireImage / Getty Images
Desiree Navarro / WireImage / Getty Images

But people, there are three daughters!!!

  Bryan Bedder / Getty Images
Bryan Bedder / Getty Images

She's kind of been hiding from us in plain sight, but you might know her now without realizing she's Meryl's offspring.

  Walter Mcbride / Corbis via Getty Images
Walter Mcbride / Corbis via Getty Images

Because perhaps you've been watching The Gilded Age on HBO? Then you have met Meryl's third daughter!!

She plays Marian Brook, THE STAR OF THE SHOW. Her real name is Louisa Jacobson, aka Meryl Streep's elusive third daughter.

HBO

This wholeeeee time she has gone under the radar because she doesn't resemble the rest of them as much as they all resemble each other.

  Taylor Hill / FilmMagic / Getty Images
Taylor Hill / FilmMagic / Getty Images

And she dropped the Gummer name, completely separating herself from her family.

  Wikipedia
Wikipedia

Not in a dramatic way, she is indeed a member of this family.

  Walter Mcbride / Corbis via Getty Images
Walter Mcbride / Corbis via Getty Images

Meryl really is her mother.

  Kevin Mazur / WireImage
Kevin Mazur / WireImage

And now, as I said, she's Marian Brook on The Guilded Age.

HBO

I consider myself knowledgeable about a lot of completely unimportant celeb-related stuff, but I had no idea about this until someone told me. So now, I'm passing along this info to you, so you can tell your mom because only she would care.

Oh, and also, Meryl Streep's daughter isn't the only celeb relative on the show.

Gladys Russell is played by Taissa Farmiga.

HBO

Her sister is Vera Farmiga.

  David Crotty / Paul Bruinooge/Patrick McMullan via Getty Images
David Crotty / Paul Bruinooge/Patrick McMullan via Getty Images

AND the show features Miranda Hobbes, who you might know as Che Diaz's girlfriend. After following Che to LA, Miranda realized that was stupid, dumped Che, and got her first acting gig on this period show. Love that for her.

HBO