Teigen took to social media on Thursday to make the announcement.
"Somebody's herrrrrrre!" she tweeted, alongside a series of baby bottle emojis. Do not cut, copy or lift any content from this website without our consent.
Months later, Teigen confirmed that she was pregnant with a baby boy, which wasn't a surprise to fans of the couple.
Teigen, 32, and Legend, 39, who are also parents to two-year-old daughter Luna, revealed they were expecting a second child in November past year - a boy. She previously posted on Instagram that they were expecting a boy.
She captioned the sweet photo of them together: "A splash with toons".