Casanova: According to Variety, Sienna Miller has been cast as Heath Ledger's lady love in Lasse Hallstrom's Casanova.

Miller, who will make her bigscreen debut in Par's forthcoming Alfie remake, joins Ledger in the Touchstone romance about the famed seducer who learns the meaning of true love when he meets a woman immune to his charms.

An August start date is slated for the pic, which will lense in Venice.