On Nashville, the 29-year-old blonde beauty played Juliette Barnes, a former teen idol fighting doggedly to become a top country music sensation.
Her character is not much different from reality as Hayden's first big break came on the Disney Channel, before she eventually landed a lead role in the cult-favorite series Heroes.
She has steadily found more adult roles ever since, allowing for some more appropriately adult (read: sexy) red-carpet moments.
Panettiere most recently played acquitted murderess Amanda Knox in the Lifetime channel original movie Amanda Knox: Murder on Trial in Italy.
Above, check out ten fiery photos of Hayden Panettiere.