"Family," he captioned a priceless family portrait.
... And it looks like Luna is already a fan of her dad's music! Check her out listening to the GRAMMY-winner's romantic tune, "The Beginning."
"We're so happy," Teigen gushed exclusively to ET earlier this month about her and Legend's new role as parents. "It's been really exciting and fun, and every day is so different, and seeing all her little changes is so cute."