The unstoppable return of Sienna Miller: How star is 'ready to be Britain's biggest Hollywood star' at 42  - 20 years after first breakthrough roles in Layer Cake and Alfie and just five months after giving birth

The 42-year-old stole the show on the red carpet in Cannes last night as she promoted her new movie: Kevin Costner 's new western epic, Horizon: An American Saga.

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