I guess, I don't think I've seen him smile genuinely much. As you say, he seems to have a fake smile at the ready as a default.He's actually super cute and really handsome when he smiles naturally. Carrie must make him fake smile, she has "The Face" and he has "The Smile".
I used to find him handsome, but he's so boring he loses some of his attractiveness. He and Carrie both win at creating none-tent (terrible content) both on Youtube and social media.