"She smiles a lot," he said. "She's got a good temperament so far. We're knocking on wood, though, because you never know. They say their two's are terrible and she's only six months so we'll see."
Luna, who Teigen said has Legend's disposition, has influenced Legend's music, which he said can be heard on his next album.
"I wrote a song for Luna, it's called "Right By You," Legend said. "I think as you grow and you're writing honestly and telling your truth, then whatever new experiences you have will affect how you write. So I'm definitely affected by being a dad and you'll hear that on the new album."