Sienna Miller, 42, dazzles in sheer gown as she brings boyfriend Oli Green, 27, and lookalike daughter Marlowe, 10, to Horizon: An American Saga premiere at Cannes Film Festival

    Sienna Miller was supported by her family on Sunday night as she was joined by her boyfriend and daughter at the premiere of her film Horizon: An American Saga at the Cannes Film Festival

    Sienna Miller was supported by her family on Sunday night as she attended the premiere of her film Horizon: An American Saga at the Cannes Film Festival with her boyfriend and daughter.

    The actress, 42, put on an ethereal display in a semi-sheer dress as she arrived on the red carpet with boyfriend Oli Green, 27, and lookalike daughter Marlowe, 10.

    It marks Marlowe’s first-ever red carpet appearance, with her famous mother only showing her face for the first time in a spread for Vogue in July 2020.

    Sienna shares Marlowe with her ex Tom Sturridge, with whom she dated from 2011 to 2015.

    While the movie star only recently welcomed a second daughter and first child with Oli in January.

    Sienna Miller was supported by her family on Sunday night as she was joined by her boyfriend and daughter at the premiere of her film Horizon: An American Saga at the Cannes Film Festival

    Sienna Miller was supported by her family on Sunday night as she was joined by her boyfriend and daughter at the premiere of her film Horizon: An American Saga at the Cannes Film Festival

    The actress, 42, put on an ethereal display in a semi-sheer dress as she arrived on the red carpet with boyfriend Oli Green, 27, and lookalike daughter Marlowe, 10

    The actress, 42, put on an ethereal display in a semi-sheer dress as she arrived on the red carpet with boyfriend Oli Green, 27, and lookalike daughter Marlowe, 10

    The actress, 42, put on an ethereal display in a semi-sheer dress as she arrived on the red carpet with boyfriend Oli Green, 27, and lookalike daughter Marlowe, 10

    It marks Marlowe's first-ever red carpet appearance, with her famous mother only showing her face for the first time in a spread for Vogue in July 2020

    It marks Marlowe's first-ever red carpet appearance, with her famous mother only showing her face for the first time in a spread for Vogue in July 2020

    It marks Marlowe’s first-ever red carpet appearance, with her famous mother only showing her face for the first time in a spread for Vogue in July 2020

    Sienna held her eldest child as Marlowe and Oli supported her at the premiere of her new epic western film.

    The Anatomy of a Scandal star turned heads in a flowing lavender dress with layers of ruffles.

    The sheer material of the draped dress allowed a glimpse of Sienna’s incredible figure in a plunging playsuit underneath.

    To add a touch of sparkle to the ensemble, the Golden Globe nominee wore a diamond necklace.

    Sienna added silver strappy heels to give herself a few extra inches and a bright pink lipstick for a pop of color.

    While daughter Marlowe looked like the spit of her beautiful mother, dressed in a sweet pink dress with a big bow.

    Beside them, Oli looked typically dapper in a black suit, white shirt and navy blue tie, while wearing brown-framed sunglasses.

    Sienna was soon joined on the red carpet by her co-stars, including the film’s co-writer, director, producer and lead actor, Kevin Costner.

    Sienna shares Marlowe with her ex Tom Sturridge, who she dated from 2011 to 2015, and only recently welcomed a second daughter and first child with Oli in January.

    Sienna shares Marlowe with her ex Tom Sturridge, who she dated from 2011 to 2015, and only recently welcomed a second daughter and first child with Oli in January.

    Sienna shares Marlowe with her ex Tom Sturridge, who she dated from 2011 to 2015, and only recently welcomed a second daughter and first child with Oli in January.

    The Anatomy of a Scandal star turned heads in a flowing lavender dress with layers of ruffles.  The sheer material of the draped dress allowed a glimpse of Sienna's incredible figure in a plunging playsuit underneath

    The Anatomy of a Scandal star turned heads in a flowing lavender dress with layers of ruffles.  The sheer material of the draped dress allowed a glimpse of Sienna's incredible figure in a plunging playsuit underneath

    The Anatomy of a Scandal star turned heads in a flowing lavender dress with layers of ruffles. The sheer material of the draped dress allowed a glimpse of Sienna’s incredible figure in a plunging playsuit underneath

    To add a touch of sparkle to the ensemble, the Golden Globe nominee wore a diamond necklace.  Sienna added silver heels to give herself a few extra inches and a bright pink lipstick for a pop of color

    To add a touch of sparkle to the ensemble, the Golden Globe nominee wore a diamond necklace.  Sienna added silver heels to give herself a few extra inches and a bright pink lipstick for a pop of color

    To add a touch of sparkle to the ensemble, the Golden Globe nominee wore a diamond necklace. Sienna added silver heels to give herself a few extra inches and a bright pink lipstick for a pop of color

    Sienna was soon joined on the red carpet by her co-stars, including the film's co-writer, director, producer and lead actor, Kevin Costner.

    Sienna was soon joined on the red carpet by her co-stars, including the film's co-writer, director, producer and lead actor, Kevin Costner.

    Sienna was soon joined on the red carpet by her co-stars, including the film’s co-writer, director, producer and lead actor, Kevin Costner.

    Kevin, 69, looked more handsome than ever in a black three-piece suit, including a waistcoat and matching bow tie

    Kevin, 69, looked more handsome than ever in a black three-piece suit, including a waistcoat and matching bow tie

    Kevin, 69, looked more handsome than ever in a black three-piece suit, including a waistcoat and matching bow tie

    Like Sienna, he made the premiere a family affair by also bringing his daughter, youngest child Grace, 13 years old

    Like Sienna, he made the premiere a family affair by also bringing his daughter, youngest child Grace, 13 years old

    Like Sienna, he made the premiere a family affair by also bringing his daughter, youngest child Grace, 13 years old

    The Oscar winner is a father of seven: he shares Annie, Lily and Joe with ex-wife Cindy Silva, son Liam with ex Bridget Rooney and Cayden, Hayes and Grace with his second ex-wife, Christine Baumgartner.

    The Oscar winner is a father of seven: he shares Annie, Lily and Joe with ex-wife Cindy Silva, son Liam with ex Bridget Rooney and Cayden, Hayes and Grace with his second ex-wife, Christine Baumgartner.

    The Oscar winner is a father of seven: he shares Annie, Lily and Joe with ex-wife Cindy Silva, son Liam with ex Bridget Rooney and Cayden, Hayes and Grace with his second ex-wife, Christine Baumgartner.

    Kevin, 69, looked more handsome than ever in a black three-piece suit, including a waistcoat and matching bow tie.

    Like Sienna, he made the premiere a family affair by also bringing along his daughter, youngest child Grace, 13.

    The Oscar winner is a father of seven: he shares Annie, Lily and Joe with ex-wife Cindy Silva, son Liam with ex Bridget Rooney and Cayden, Hayes and Grace with his second ex-wife, Christine Baumgartner.

    Isabelle Fuhrman, Abbey Lee and Jena Malone also appeared glamorous on the red carpet, all opting for semi-sheer and pastel-colored dresses.

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

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