Horizon: An American Saga': Sam Worthington, Sienna Miller, Kevin Costner Charm The Audiences At The Los Angeles Premiere

Wase Chief, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Tatanka Means, a cast member in "Horizon: An American Saga," waves to photographers at the premiere of the film at the Regency Village Theatre in Los Angeles.

Luke Wilson, left, and Alejandro Edda, cast members in "Horizon: An American Saga," greet each other on the carpet at the premiere of the film at the Regency Village Theatre in Los Angeles.

Georgia MacPhail, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Michael Rooker, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Isabelle Fuhrman, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Ella Hunt, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Abbey Lee, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Jena Malone, left, a cast member in "Horizon: An American Saga," greets fellow cast member Ella Hunt on the carpet at the premiere of the film at the Regency Village Theatre in Los Angeles.

Sam Worthington, right, a cast member in "Horizon: An American Saga," poses with his wife Lara at the premiere of the film at the Regency Village Theatre in Los Angeles.

Sienna Miller, a cast member in "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.

Kevin Costner, the director, co-writer and star of "Horizon: An American Saga," poses at the premiere of the film at the Regency Village Theatre in Los Angeles.