Detroit, Michigan, stars Eminem and Kid Rock have been challenged to a freestyle rap battle, which could pocket their chosen charities $1 million. The offer comes from the producers of new movie Rap Therapy, which chronicles one Detroit social worker's efforts to use hip hop to help steer troubled teens away from gang-banging, drugs and violence.

The rap challenge was officially launched in Detroit on Tuesday.

Blake LeVine, the subject of the film Rap Therapy, says, "It will be a televised rap battle and the winner will pick up $1 million for the charity of his choice."

The documentary features footage of 50 Cent, Diddy, Anne Hathaway, Fergie and Tom Cruise, talking about the benefits of hip-hop as a tool for kids involved in gang violence and abuse.

-Kid Rock Ringtones
-Kid Rock Pictures
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-Eminem Pictures

(This news article provided by World Entertainment News Network)