Actress Sarah Alexander has joined the cast of Matthew Vaughn's fantasyepic Stardust. She will play Empusa, a 400-year-old witch.

The film also stars Robert de Niro, Michelle Pfeiffer, Claire Danes andnewcomer Charlie Cox.

Filming starts in June.

Alexander has appeared on UK TV shows including Coupling and Green Wing and she alsorecently filmed Amy Heckerling's I Could Never Be Your Woman.