Gladys Knight joins Tyler Perry film

Adam Rodriguez also lands role in 'I Can Do Bad'

Tyler Perry has Grammy fever.

The writer-director has added seven-time winner Gladys Knight and gospel performance winner Marvin Winans to the cast of his latest film, "I Can Do Bad All by Myself." Perry already had cast Mary J. Blige, who's got nine Grammy statuettes on her mantel.

"CSI: Miami" star Adam Rodriguez also has come on board the Lionsgate project.

Perry, Oscar nominee Taraji P. Henson, Brian White, Hope Olaide Wilson, Kwesi Nii-Lante Boakye and Frederick Siglar also will appear in Perry's adaptation of one of his early plays. The story line follows what happens when Perry's iconic Madea character discovers a 16-year-old girl (Wilson) and her brothers looting her home and sends them to live with their Aunt April (Henson), a hard-drinking nightclub singer.

Knight will play Wilma, a kind of matriarch of the neighborhood and singer at Marshall Baptist Church, where Madea also circulates. Knight, Winans and Blige all will sing in the film, with Blige performing an original song penned by Ne-Yo.

Production is under way at Tyler Perry Studios in Atlanta for a Sept. 11 release.

Knight, repped by WMA and Jay D. Schwartz & Associates, recently cameoed on the NBC's "30 Rock." She last appeared on the big screen in "Hollywood Homicide."

Rodriguez, repped by Global Artists Agency and A Management Co., was a regular on "Roswell" and "Brooklyn South."