Hannah Montana Season 1 Episode 17

Miley's twin cousin from Tennessee named Luanne, spends Halloween in Malibu with Miley. Then, Luanne goes to the Hollywood Halloween party as Hannah to expose Miley's secret identity.

Title: Torn Between Two Hannahs

Miley's evil identical cousin, Luann (Miley Cyrus) from Tennessee visits, and disguises herself as Hannah in order to reveal Miley's secret at Traci Van Horne's Halloween party. Meanwhile, Robby and Jackson decorate their house to make it look scarier than their neighbour's.
Title reference: "Torn Between Two Lovers" by Mary MacGregor.