Sienna Miller goes braless under a blazer and baggy jeans as she joins dapper co-star Kevin Costner at the Horizon: An American Saga photocall during Cannes Film Festival

Kevin Costner and Sienna Miller were in good spirits as they attended the Horizon: An American Saga photocall during the Cannes Film Festival on Sunday.

The actress looked stunning as she went braless under a beige bouclé blazer which she paired with black wide-leg jeans.

Sienna, who plays Frances Kittredge, left her long blonde locks loose in waves and elevated her body with a pair of statement gold metallic heels.

Meanwhile, Kevin, 69, cut a dapper figure in a white suit, which he teamed with a matching open-collar shirt and beige loafers.

The Hollywood actor, who plays pioneer Hayes Ellison who heads West through dangerous territory in the hope of a new life in the new film, wore black sunglasses.

Kevin Costner and Sienna Miller were in good spirits as they attended the Horizon: An American Saga photocall during the Cannes Film Festival on Sunday

The actress looked stunning as she went braless under a beige bouclé blazer which she paired with black wide leg jeans

He was accompanied by his son Cayden, who looked stylish in a white linen jacket and trousers, which he donned with a blue T-shirt and trainers.

It comes after Kevin debuted a terrifying new poster for his $100 million gambling film series Horizon: An American Saga,

Horizon: An American Saga chronicles a multifaceted, 15-year period of expansion and settlement of the American West before and after the Civil War.

The film series will be released in two chapters on June 28 and August 16.

The first film chronicles a fifteen-year period of expansion and settlement of the American West before and after the Civil War.

In the poster, Kevin sports a mustache and hat, paired with a cardigan and scarf as he stares into the sunset.

Kevin, who has been desperately trying to bring the four-part film series to life for over thirty years, is said to have personally raised up to $50 million of Horizon’s $100 million budget with the move.

Sienna, who plays Frances Kittredge, left her long blonde locks down in waves and elevated her body with a pair of statement gold metallic heels.

Sienna looked sensational as she arrived at the event in sunglasses

She completed the cool outfit with a pair of large gold earrings

Meanwhile, Kevin, 69, looked dapper in a white suit, teaming a matching open-collar shirt and beige slip-on shoes

The Hollywood actor, who plays pioneer Hayes Ellison who heads west through dangerous territory in the hope of a new life in the new film, was accompanied by his son Cayes.

The pair are also joined in the film by (L_R) Isabelle Fuhrman, Ella Hunt and Abbey Lee

Horizon: An American Saga chronicles a multifaceted, 15-year period of expansion and settlement of the American West before and after the Civil War

The film series will be released in two chapters on June 28 and August 16

Kevin is said to have a net worth of around $250 million and reportedly collects $1.5 million per episode of his hit show Yellowstone, making him the highest-paid actor on TV.

Horizon also stars Sienna, Sam Worthington, Jena Malone, Michael Rooker, Danny Huston, Luke Wilson, Isabelle Fuhrman, Jeff Fahey, Will Patton, Tantanka Means, Owen Crow Shoe, Ella Hunt and Jamie Campbell Bower.

Introducing the trailer during a Zoom call with reporters earlier this year, Kevin said: “There has been a great injustice done in the West, but that doesn’t diminish the courage it took for my ancestors to actually break free and to go there.

“And I recognize the ingenuity and courage it took to leave and make this march across this country.”

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