Sienna Miller has landed roles in two major Hollywood films thanks to her profile being raised in the US.

Sienna's face has appeared on numerous US magazines after fiance Jude Law admitted to an affair with his children's nanny.

She will play Edie Sedgwick in Factory Girl and the Queen of Sparta in 300, based on the Battle of Thermopylae reports the Mirror.

She was originally cast as Edie Sedgwick but film bosses told her they wanted to recast the role with a more famous face.

After Jude's admission film bosses are fighting to sign Sienna to their films.

A source said: "This is not the way Sienna would have liked to have won the role of Edie but she simply wasn't famous enough in the States. Now she's deemed A-list famous."

Source: Press Release