Sienna Miller is replacing Lindsay Lohan in The Best Time of Our Lives, the John Maybury-directed drama.

It stars Keira Knightley, Cillian Murphy and Matthew Rhys; the film was written by Knightley's playwright mother Sharman Macdonald, based on a rivalry between two women over the Welsh poet Dylan Thomas (Rhys). Variety says Miller will play his wife, Caitlin MacNamara, and Knightley plays his childhood friend Vera Phillips.

The Best Time of Our Lives begins shooting in early May in Wales.