Sienna Enlists In Forces

Sienna Miller has signed up to star in a movie version of GI Joe.

The actress will play a sexy femme fatale skilled in espionage.

Military action hero GI Joe started life as a Second World War comic strip and went on to become a popular series of toys in the US.

The film is set at the Brussels-based GIJOE - an acronym for the Global Integrated Joint Operating Entity - where a band of special operatives battle to defeat Cobra, an evil organisation headed by a Scottish arms dealer.

The 25-year-old is the first star to sign on for the big-budget production.

GI Joe will be directed by The Mummy's Stephen Sommers.

Filming begins in February and release is scheduled for August 2009.