Both women went into labour on Monday (22Jul13), and the singer's little lady popped out before Britain's new prince or princess.
Scott gave birth to daughter Eisele Kaye Tyrrell in Nashville, Tennessee.
The newborn's name is a combination of her grandmothers' maiden and middle names.
Proud dad Chris Tyrrell tells People.com his baby daughter is "incredibly gorgeous".
The drummer wed Scott in January, 2012, and she announced the pregnancy in December (12).