Sienna Miller has walked the red carpet at the Cannes Film Festival with her daughter Marlowe Ottoline Layng Sturridge.

The 42-year-old actress, who was born in the US but brought up in the UK, has been promoting her new film Horizon: An American Saga, directed by Kevin Costner.

Miller – who will appear in this film and its next instalment – plays East Coast settler Frances Kittredge, who moves to the Horizon settlement with her husband and two children.

Miller wore a pale blue floor-length gown, while 12-year-old Marlowe wore a white dress with a large pale pink bow around the waist for her red carpet debut.

Miller gave birth to Marlowe, whose father is The Sandman star Tom Sturridge, 38, in 2012.

She had a second daughter earlier this year with The Crown actor Oli Green, who also attended the premiere.

Miller and Green, 27, met at a Halloween party thrown by a mutual friend and have since moved to London together.

Hollywood star Kevin Costner wins child support battle with estranged wife Christine Baumgartner – reports

Kevin Costner and wife of nearly 19 years Christine Baumgartner to divorce

Can new streamer Paramount+ compete with the likes of Netflix, Disney+ and co?

Costner – who not only directs the film but also co-wrote and stars in it too – had plenty of family support on the red carpet.

The 69-year-old Hollywood star brought five of his seven children – Annie, 40, Cayden, 17, Grace, 13, Lily, 37, and Hayes, 15. The latter makes his screen acting debut in the movie.

Horizon: An American Saga spans four years of the Civil War, from 1861 to 1865, and is described by the studio behind it, Warner Bros, as an “ambitious cinematic adventure” telling the story of the United States of America “through the lens of families, friends and foes”.

Brace yourself for a three-hour epic – and more to come

The two-part western – of which this is the first chapter – received a 10-minute standing ovation when it premiered on Sunday.

Costner also says he has scripts ready for two further instalments in the story, which would extend the epic to four parts if commissioned.

The Yellowstone star, who first pitched a version of the movie back in 1988, has plenty at stake in the project, and personally financed around $100m for the film and its sequel.

He will be hoping to emulate the success of his 1990 directorial debut Dances With Wolves, which he also starred in and produced. The movie was a box office hit, winning multiple Oscars including best picture and best director.

Horizon: An American Saga runs for over three hours and will come to UK cinemas at the end of June.

It also features Avatar star Sam Worthington, Donnie Darko actress Jena Malone and Owen Wilson’s brother Luke Wilson.

Related posts:

Britney asks court to end father’s role in controlling her money Jennifer Aniston leads tributes as James Michael Tyler, who played Gunther in Friends, dies at 59 Richard Madeley taken to hospital after falling ill on I’m A Celebrity set Bruce Willis gets own category at Razzie Awards after eight bad films in 2021 Oscar-winning actor William Hurt dies aged 71 Oscar-winning director held in Italy over sexual assault allegations Blac Chyna agrees Kardashian settlement ahead of second trial Margot Robbie will return to Ramsay Street for Neighbours finale Peter Kay announces first stand-up tour in 12 years Aaron Carter autopsy report explains cause of bathtub drowning that led to his death From Brad Pitt to Jane Fonda: Hollywood stars supporting the actors’ strike Angelina Jolie’s father critical of her stance on Israel attacks