<Ul> <Li> Kathryn Grayson as Magnolia Hawks </Li> <Li> Ava Gardner as Julie LaVerne (singing voice dubbed by Annette Warren) </Li> <Li> Howard Keel as Gaylord Ravenal </Li> <Li> Joe E. Brown as Cap'n Andy Hawks </Li> <Li> Marge Champion as Ellie Mae Shipley </Li> <Li> Gower Champion as Frank Shultz </Li> <Li> Robert Sterling as Steve Baker </Li> <Li> Agnes Moorehead as Parthy Hawks </Li> <Li> Leif Erickson as Pete </Li> <Li> William Warfield as Joe </Li> </Ul> <Li> Kathryn Grayson as Magnolia Hawks </Li> <Li> Ava Gardner as Julie LaVerne (singing voice dubbed by Annette Warren) </Li> <Li> Howard Keel as Gaylord Ravenal </Li>

Who sang ava gardner's part in showboat