Maggie Q – the sexy Asian star of Mission: Impossible III and Live Free or Die Hard – is joining Paul Bettany and Cam Gigandet in Priest, a horror Western that Scott Stewart is directing for Screen Gems. Adapted by Cory Goodman from a TokyoPop comic, “Priest” is set in a world ravaged by war between man and vampires and follows a warrior priest (Bettany) who teams with a sheriff (Gigandet) to track down a murderous band of vampires who have kidnapped his niece. Q will play a priestess — a vampire hunter as tough as the priests — who also joins Bettany. The film is slates for release on August 13, 2010. Bettany is also toplining Legion for Screen Gems.