The Spice Girls singer sports dreadlocks, a nose ring and a leather jacket as she poses on a set of steps in the new release.
Mel C will feature alongside Chris Moyles (King Herod), Tim Minchin (Judas) and Ben Forster, winner of the Superstar reality show she helped judge, in the upcoming 21-date arena tour.
"Rehearsals have been going brilliantly," she said in a statement on the official Jesus Christ Superstar website.
"I feel so lucky to be a part of this incredible production. Mary Magdalene is such a wonderful role."
The Jesus Christ Superstar tour will begin at London's O2 Arena on September 21, before moving to venues in Glasgow, Newcastle, Manchester, Cardiff, Birmingham, Belfast, Dublin, Liverpool and Nottingham.
It will also play in Wembley Arena (October 17) before coming to a close on October 21 at Sheffield Motorpoint.