Kathryn was raised in Ruston, Louisiana, and graduated from Ruston High School. She attended the University of Louisiana at Lafayette where she earned her bachelor's degree in behavioral sciences. After graduating from UL, Kathryn returned home to Ruston and worked at Mortgage Contracting Services for several years and then as a paralegal at her father's local personal injury and medical malpractice firm. Kathryn attended law school at LSU where she received her Juris Doctor and D.C.L.

Kathryn is married to Aaron Lawrence. They have three children: Beau, Jack, and Rhett.