Katharine McPhee and David Foster welcome 1st child together, a healthy baby boy, but the former says, 'I always wanted a girl'

While it is Katharine McPhee's 1st child, 71-year-old David Foster already has 5 children, all daughters; 34-year-old Jordan, 38-year-old Erin, 40-year-old Sara, 47-year-old Amy and 50-year-old Allison; from his past relationships