Underwood was born March 10, 1983 in Muskogee, Oklahoma, the daughter of Carole (Shatswell) and Stephen Underwood. She was raised on her parents' farm in the nearby rural town of Checotah.Her father worked in a sawmill, while her mother taught elementary school.She has two older sisters, Shanna and Stephanie.nderwood was born March 10, 1983 in Muskogee, Oklahoma, the daughter of Carole (Shatswell) and Stephen Underwood. She was raised on her parents' farm in the nearby rural town of Checotah. Her father worked in a sawmill, while her mother taught elementary school. She has two older sisters, Shanna and Stephanie.