The “All of Me” hitmaker was said to have shared the news with attendees at a private concert on Friday (13 January), a representative for Legend confirmed to The Independent.
According to news reports, Legend, 44, said he and Teigen welcomed the new baby “this morning”, calling it a “blessed day”.
The Grammy winner reportedly added that that he “feels energised”even though he “didn’t get a lot of sleep” after spending “a lot of time” at the hospital.
Legend and Teigen, 37, share two children – daughter Luna, 6 and son Miles, 4 – together.
She posted a photo, showing off her baby bump in a pink tie-dye string bikini, alongside comments about the pregnancy feeling longer than usual.
“‘Omg I feel like she’s been pregnant foreverrrrrr,’” the Lip Sync Battle star wrote, mimicking some of the comments she’s received on her posts. “How do you think I feel thank u”.
Replying to journalist Yashar Ali’s comment about how “this happens every time” with her pregnancies, Teigen said: “I announced in August! I’m not a possum”.
“I hope you feel like punching those people,” another user wrote. “I know I did”.
The couple’s pregnancy announcement came two years after Teigen and Legend revealed that they had lost their son Jack at 20 weeks as a result of a pregnancy complication.
Speaking at a summit in September last year, Teigen shared that it took her “over a year” to realise she had a life-saving abortion, not a miscarriage as she had previously labelled the tragic loss.
The model and food writer added that she came to the realisation she’d had an abortion after the US Supreme Court overturned Roe v Wade in June. It was Legend who said that they’d had an abortion.