Regner was born and raised in the Baton Rouge area, the daughter of Jan and Donald Regner, a businessman. She has a sister, Lauren Regner, who is also a performer. She is a graduate of Parkview Baptist High School, and graduated from Louisiana State University with a degree in theatre in 2011. In college, she was a member of the sorority Kappa Delta. In Baton Rouge, she performed at the Theatre Baton Rouge in productions of Rent as Maureen and The Producers. While at LSU, she performed in the musical Spring Awakening. In 2010, she played the role of Crystal in Little Shop of Horrors at the Ascension Community Theatre.