The 37-year-old new dad first doted on his "adorable" daughter, and praised his bundle of joy for her kind and calm demeanor.
"She smiles a lot. She's got a good temperament so far. We're knocking on wood, though, because you never know," Legend said on Thursday's Ellen. "They say their twos are terrible and she's only six months, so we'll see."
While the two have been spending their time being two of the most loving parents in show business, as well as traveling across the country to stump for Hillary Clinton's presidential campaign, Legend has also been working on the upcoming romantic musical dramedy La La Land.
The film stars Ryan Gosling and Emma Stone, but Legend also has a role ("way down below them") in the hotly anticipated project, which is already getting a lot of Oscar buzz months before its release.
"It was fun!" he shared. "We had a great time. I wrote a song for it, and I'm an executive producer as well, so we had a lot of fun making that."
The film -- which tells the tale of a jazz pianist (Gosling) who falls in love with an aspiring actress (Stone) while they are both trying make their way in the heart of Los Angeles -- hits theaters Dec. 9.