Question: who plays adele webber on grey's anatomy
Answer: Loretta Devine ( born August 21 , 1949 ) is an American actress and singer , best known for her roles as Marla Hendricks in the Fox drama series Boston Public , and for her recurring role as Adele Webber on the Shonda Rhimes ' Grey 's Anatomy , for which she won a Primetime Emmy Award for Outstanding Guest Actress in a Drama Series in 2011 .