Kevin Costner, Sienna Miller, & 'Horizon' Movie Cast Attend L.A. Premiere - Red Carpet Photos Revealed!

Kevin Costner is ready for the world to experience his movie Horizon: An American Saga!

The Oscar-winning actor and filmmaker walked the red carpet with his star-studded cast at the Chapter 1 premiere on Monday night (June 24) at the Regency Village Theatre in Los Angeles.

Also in attendance were Sienna Miller, Isabelle Fuhrman, Sam Worthington, Michael Rooker, Jena Malone, Michael Angarano, Giovanni Ribisi, Abbey Lee Kershaw, Jamie Campbell Bower, Jon Beavers, Owen Crow Shoe, Tatanka Means, Wase Chief, Luke Wilson, Ella Hunt, Tom Payne, Alejandro Edda, Colin Cunningham, Michael Provost, Larry Bagby, Kevin‘s son Hayes Costner, James Landry Hebert, Georgia MacPhail, Bodhi Okuma Linton, and more.

Horizon: An American Saga “explores the lure of the Old West and how it was won—and lost—through the blood, sweat and tears of many. Spanning the four years of the Civil War, from 1861 to 1865, Costner’s ambitious cinematic adventure will take audiences on an emotional journey across a country at war with itself, experienced through the lens of families, friends and foes all attempting to discover what it truly means to be the United States of America.”

Chapter 1 hits theaters on June 28 and Chapter 2 will quickly follow on August 16. Check out the trailer here!

FYI: Sienna is wearing a Chloe dress and Anita Ko jewelry. Isabelle is wearing a Carolina Herrera dress, Piferi shoes, and Cartier jewelry. Abbey is wearing a Celine dress. Ella is wearing a Celine dress. Jamie is wearing Tom Ford. Jena is wearing a Roland Mouret dress and Santoni shoes.

Browse through the gallery for 60+ photos from the premiere…