Making the switch between music to film is something that a lot of singers have tried. I watched a trailer for a movie today called 13, it seems like a fairly decent thriller with respectable actors like Jason Stathom and Mickey Rourke and then came the sub title “Curtis 50 Cent Jackson” and my whole perspective on the film changed for about three seconds, and from the short time he is in the trailer he seems pretty good.
There are only a few singers that have made this change gracefully. Beyonce made a pretty smooth transition from singing to acting although she usually only takes on projects that require a singer anyway. Another example of smooth transitions is Frank Sinatra, forever my hero, was in a number of movies but most notably the original Oceans 11.
Not everyone can make the change as easily as others. Most notably Mariah Carey, her performance won her a nomination for a Razzie, basically the same thing as an oscar just reverse.