Sienna Miller

Sienna Miller has stepped in to replace Lindsay Lohan in upcoming Dylan Thomas biopic The Best Time of Our Lives.

Lohan pulled out of the project last week, citing contractual issues.

Miller will join Keira Knightley, Cillian Murphy and Matthew Rhys in the film, which begins shooting in Wales next month.

The movie, written by Knightley's mother Sharman MacDonald, focuses on the love triangle between the Welsh poet (Rhys), his wife Caitlin (Miller) and mistress Vera Phillips (Knightley).