The name of their son, born Friday, April 17 in a Nashville-area hospital, still hasn't been revealed, reports Usmagazine.com.
The baby's 2-year-old brother is named William Huckleberry.
They do not yet have a name for the newborn, which is the couple's second child. They are also parents to 2-year-old son William Huckleberry.
The couple wed in March 2003.
Update: The newborn's name is Jasper Warren Paisley. The middle name is in honor of Paisley's grandfather who gave him his first guitar and encouraged him to pursue music.