“In honor of “Labor” Day, Ace & Penny would like to make an announcement. Their parents couldn’t be happier,” the American Idol alum and animal lover captioned a photo with her two dogs wearing “I’m going to be a big brother” and “I’m going to be a big sister” tee-shirts.
Just last year, Underwood said she didn’t “feel old enough” to have children.
“I know I am mature,” she told Marie Claire. “But being responsible for another human?”