Model Chrissy Teigen and hubby John Legend celebrated their fourth anniversary back in September. The actress shared news on her Instagram account on Tuesday that she is pregnant with their second child. The couple is having a baby girl as the first child, named Luna. Teigen 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. 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.”

Teigen confessed, that "she and Legend started out with about 20 embryos. But after narrowing them down to the ones you know are going to be good for your body,” only three remained. “The first little girl didn’t work, and then the second is Luna,” she said. And it seems the third and last embryo was implanted successfully.