Now the Newcastle-born actor, right, plans an attention-grabbing return to the public arena – he is to take over from Harry Potter star Daniel Radcliffe in the West End play Equus, in which he performs a nude sex scene.

The producers of the film version of the Abba musical, Mamma Mia! are reportedly keen to audition the 25-year-old actress, even though she has yet to prove her singing credentials.

While her agency denies she is in talks, Sienna recently revealed she was ‘looking at a musical role' and told how she plans to kick the ciggies and start taking singing lessons.

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