"It's John's!" Teigen hilariously captioned the video, referring, of course, to her hubby, Grammy victor John Legend. Teigen asked, moving the camera to focus on her stomach. "They think Luna will do a great job with the baby and they're really happy to be expanding their family". Teigen captioned the video.
Chrissy Teigen and John Legend are expecting a second baby.
See a list of celebrities who posed naked and pregnant for magazines and more scandalous nude celeb baby bump photos.
"Maury will have the final word on this", Legend jokingly replied in the comments.
John and Chrissy have been very open about her fertility struggles in the past.
Another wrote: "I can not wait to see another lovely creation from you and John".
Well, it might have been because Teigen was doing some particularly adept bump-hiding on her Instagram up until now.
Praising the couple for their unique announcement, one follower noted: "This video is everything". Teigen has previously said on Twitter, "Since this is coming up again, I said our next baby would be a boy because that is the embryo we have left". For us, it's hard because he's on the road so much and I'm working. But after narrowing them down to the ones "you know are going to be good for your body", only three remained.