The 36-year-old singer and actress recently welcomed her first child, son August Harrison, with her husband, musician Taylor Goldsmith.
Moore shared the news Tuesday on Instagram alongside a photo of her baby boy. The picture shows a closeup of Moore's son wearing a blue onesie.
"Gus is here. Our sweet boy, August Harrison Goldsmith," Moore captioned the post. "He was punctual and arrived right on his due date, much to the delight of his parents."
"We were prepared to fall in love in all sorts of brand new ways, but it goes beyond anything we could have ever imagined," she said.
Singer Vanessa Carlton and actresses Kiernan Shipka and Kimberly Williams-Paisley were among those to congratulate Moore and Goldsmith in the comments.
"Such precision Gus! Congrats you guys. Enjoy the most profound ride x," Carlton wrote.
"GUS!! We have a Gus in our family too! Congratulations!" Williams-Paisley said.
Moore and Goldsmith married in November 2018 and announced in September that they were expecting a son. "Baby Boy Goldsmith coming early 2021," Moore said on Instagram.
Moore said earlier this month that her birth plan had changed after her platelet count dropped dramatically. Moore plays Rebecca Pearson on This is Us, which is in its fifth season on NBC.
On Late Night with Seth Meyers in November, Moore discussed how the multiple timelines on This is Us made it impossible for her real-life pregnancy to match up with her character's.
"It's funny because the trajectory of our show is, we sort of jump around in time all the time," the actress said. "In fact, the very first episode I was in, we sort of took it back to going to the hospital to give birth to the triplets that day."
News broke Monday that Moore's This is Us co-star Justin Hartley finalized his divorce from his wife, Selling Sunset star Chrishell Stause, this month.
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