Teigen, 32, shared the news on Twitter on Thursday May 17 writing, "Somebody's herrrrrrre!" along with baby bottle emojis".
The couple has welcomed their second baby, a son.
The couple have been open about their struggles with infertility and IVF, welcoming Luna via IVF and past year Teigen underwent a frozen embryo transfer to fall pregnant again with their second child. It's understood, however, that the baby made his arrival sooner than expected, as Chrissy had previously revealed her due date was in June.
"I have a husband who truly loves the whole experience", she said. "It's so easy to try to figure out what you might have done "wrong" and do the opposite the next time". Legend retweeted her post.
"The depression thing came out of nowhere!" I mean I knew I was pregnant at 11 days in.
All in all, we're thankful for Chrissy getting real on fertility and motherhood, but today we're sending our congratulatory wishes to the new mum-of-two!