*Gabrielle Union is the newest cast member added to "Cadillac Records," an indie film about the life of Chess Records founder Leonard Chess with Adrien Brody in the starring role.      

       The period piece follows the rise and fall of the famed label, which launched the careers of such R&B greats as Muddy Waters, Etta James and Chuck Berry.       

       According to Blackfilm.com, Union will play Geneva Wade, the girlfriend, and later wife, of Waters, who is portrayed by Jeffrey Wright.       

       The Darnell Martin-directed film stars Beyonce as Etta James, Cedric the Entertainer as Willie Dixon, Eamonn Walker as Howlin' Wolf, Columbus Short as Little Walter and Mos Def as Chuck Berry.

       In other "Cadillac" news, Beyonce has apparently redeemed herself with fans on the film's Harrison, N.J. set. Kids who waited hours in the rain last week for her autograph were left hanging when she ran right past them. But the former Destiny's Child leader reportedly came back out after shooting her scene that day and took time to give out her John Hancock, reports the New York Daily News.