Audra McDonald has solely been a screen actress.
Audra Ann McDonald ( born July 3 , 1970 ) is an American actress and singer . She has appeared on the stage in both musicals and dramas , such as Ragtime , A Raisin in the Sun , and Porgy and Bess . She starred as Dr. Naomi Bennett on the ABC television drama Private Practice . Porgy and Bess is an English-language opera composed in 1934 by George Gershwin , with a libretto written by DuBose Heyward and Ira Gershwin .