Loretta Devine (born August 21, 1949) is an American actress and singer, best known for her roles as Lorrell Robinson in the original Broadway production of Dreamgirls , Marla Hendricks in the Fox drama series Boston Public , and for her recurring role as Adele Webber on the medical drama Grey's Anatomy , for which she won a Primetime Emmy Award for Outstanding Guest Actress in a Drama Series in 2011. She had a role in the series Everybody Hates Chris as Rochelle's mother. In film, Devine appeared in Waiting to Exhale , The Preacher's Wife , Hoodlum , I Am Sam , Urban Legend , What Women Want , Kingdom Come , Crash , Woman Thou Art Loosed , Class Act , For Colored Girls , This Christmas , First Sunday , Beverly Hills Chihuahua and Jumping the Broom . She also played Cynthia Carmichael on the NBC sitcom The Carmichael Show .