"A week ago I didn't think I could be any happier. I was wrong. Our brand new baby boy Ryker Mobley Brice was born healthy. My heart is full," Brice, who is nominated for best country solo performance for "I Drive Your Truck," writes.
"Sara is the strongest and most amazing woman I know. She did so good and he is perfect."
The couple kept the pregnancy under wraps until September, when Brice broke the news with two snapshots of his growing family, including one cheeky picture of 4-year-old son Takoda using binoculars to search for his baby brother.