Katherine Waterston is going to be a mom.

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The 38-year-old actress debuted her baby bump Tuesday at the London premiere of "Fantastic Beasts: The Crimes of Grindelwald."

Waterston showed off her growing belly in a yellow dress that was formfitting around her midsection.

She held her bump at one point as she posed for photos.

E! News said Waterston's co-stars Ezra Miller and Alison Sudol were spotted cradling the actress' belly.

Eddie Redmayne, Jude Law, Johnny Depp, Dan Fogler, Zoe Kravitz and Claudia Kim were also present at the event.

Waterston has yet to share the identity of the baby's father or address her pregnancy.

She discussed her desire for privacy in an interview with Natasha Lyonne for Interview magazine in May 2017.

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"It's probably psychotic, but I live in these two extremes. In the work, it's all output and expression, obviously, and in a sense, it's a very social activity. But I find I need to recover a little from that," the star said.

"You're like that, too," she told Lyonne. "We've canceled plans because both of us have felt like hiding from the world."

Waterston plays Tina Goldstein in "Fantastic Beasts: The Crimes of Grindelwald," which opens in theaters Friday.

The film is a sequel to "Fantastic Beasts and Where to Find Them," which is based on the book by "Harry Potter" author J.K. Rowling.

Photo credit: Fantastic Beasts / Instagram