Teigen announced the newborn's arrival on Twitter Wednesday. "Somebody's herrrrrrre!" she tweeted alongside baby bottle and high five smiley face emojis.
The birth was also confirmed by People magazine. No other details were shared concerning the baby who was due in June.
Teigen and Legend, who are already parents to 2-year-old daughter Luna, announced in November that they were expecting a second child.
Somebody’s herrrrrrre! 🍼🤗🍼🤗— christine teigen (@chrissyteigen) May 17, 2018
Teigen and Legend recently discussed how the second pregnancy was harder due to already being parents.
"You have to divide your energy between raising a kid and carrying one as well," Legend said.