The celebrity couple also have a daughter, 2-year-old Luna.
According to E!, Teigen and Legend, 39, "elected to undergo a frozen embryo transfer in hopes of becoming pregnant again" in 2017. People reported that the couple welcomed their son early. Teigen previously announced that the baby was due in June.
Recording artist John Legend and model Chrissy Teigen attend the 60th annual Grammy Awards at Madison Square Garden on January 28, 2018, in New York City. (Photo by Christopher Polk/Getty Images for NARAS)
When asked how she and Legend came up with Luna, Teigen revealed it was linked to a happy childhood memory.
“Well, there was a blood moon happening. It was like a very beautiful night. Really big, vivid red moon — just gorgeous. And I have this love for space, and I think about space camp all the time and my days at space camp as a youngster, so I just thought ‘Luna’ was perfect.”
Like a true comedian, DeGeneres joked that the second baby should follow the trend, saying, “What about Lunar?”
Teigen replied with a laugh, “Lunar? I like it,” while Ellen followed up, “What about Urban Legend?”