Keys, 31, is just two months away from giving birth to her second child, reported People magazine.
"He is excited to be a big brother. I think he's super excited because he's not going to be the youngest anymore. He's always kissing my belly," Keys said.
The singer, whose second child with husband Swizz Beatz is due on December 31, went on to say that having children has inspired her to work harder for social justice.
"Being a mother has definitely furthered my passion for Keep a Child Alive and just talking about issues in the world overall," she added.