Jordan Catherine Bentley arrived Saturday, Dec. 25, weighing in at 7 lbs., 14 oz, the country singer's rep tells PEOPLE. She joins big sister Evalyn Day, 2.
"Say what [you] want about Santa's physique, but no arguing his impeccable timing! Evie wanted a little sis for Xmas & Jordan just arrived!" the Grammy-nominated singer, 35, posted on Twitter.
"She chose the banjo-driven part of Mumford & Sons 'Awake My Soul' as her walk on music ... could be a troublesome sign."
Reporting by EILEEN FINAN