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Model Chrissy Teigen took to Instagram Tuesday to share news that her and husband John Legend are pregnant with their second child.

Teigen, 31, posted a video of herself asking her first-born, Luna, “What’s in here?” while showing off her baby bump.

“Luna, what’s in here?” Teigen asked in the video, which is captioned “it’s john’s!”

“Baby!” Luna responded.

Legend, 38, jokingly commented: “Maury will have the final word on this.”

The child will be Teigen and Legend’s second, and could possibly be a boy, according to Entertainment Tonight.

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The couple has been candid about their struggles with infertility. In August, Legend told Cosmopolitan that while the two are able to conceive on their own, it remains a challenge.

“I wouldn’t say we can’t conceive naturally, but I would say that it’s enough of a challenge where it felt like we needed help,” Legend said. “We’re lucky that we’re living in an age where we can conceive in other ways. [IVF] brought us Luna and hopefully it will bring us a few more awesome kids, too.”