The 71-year-old has five daughters from three prior relationships. These include Allison from a relationship in his youth; Amy from his first marriage to B.J. Cook; Sara, Erin, and Jordan with second wife Rebecca Dyer, reported Billboard.
Katharine's rep confirmed to People Magazine that the former American Idol runner-up had delivered her child.
"Katharine McPhee and David Foster have welcomed a healthy baby boy," the rep stated. "Mom, Dad, and son are all doing wonderfully."