The 40-year-old singer and Minnillo, who have 18-month-old son Camden, is planning for their second child, reported Contactmusic.
"We won't wait too much longer. I really want to have a little girl," Lachey said.
The singer feels that the second child will grow up in the same manner as their son.
"Cam's got the best temperament ever, we can't imagine having a better kid than we do.