Mandy Moore is now mom to her own Big Three.

The This Is Us star and her husband Taylor Goldsmith—who tied the knot in 2018—welcomed their third child together, a baby girl.

“Lou is here!” she captioned a Sept. 25 Instagram photo of holding her newborn while gazing up at her husband, “Louise Everett Goldsmith arrived happy, healthy, expeditiously and right in time for Virgo season. She is our absolute dream girl and her big brothers are already as obsessed with her as we are.” 

She continued, “Endlessly grateful for our family of 5 (and our very own big three) and soaking in every moment of this special time.”

Mandy announced her pregnancy in a May 31 Instagram post that featured their two sons—August “Gus” Harrison, 3, and Oscar “Ozzie” Bennett, 21 months—wearing shirts that said, “Big” and “Middle,” respectively.

“Sometimes life imitates art,” the 40-year-old wrote in the caption, referring to her character on the NBC drama who has two sons and a daughter. “The third in our own Big Three coming soon. Can’t wait for these boys to have a baby sister.”

Mandy had previously expressed being open to add a third little one into their family.

“Truth be told, I haven’t shut the door on a larger family,” she told E! News in March 2023. “I don’t know what my husband is thinking. I know right now, he’s sort of like, ‘Whaaat? That’s crazy! It’s so hard.’ And it is. It’s so hard. It’s non-stop, all hands on deck right now. So maybe, perhaps. but I don’t know.”