Written by Joseph Mankiewicz, it is about a young actress who worms her way into the life of Broadway star Margo Channing.  
One of the main roles in this film had to be recast after an accident on the set of Three Came Home prevented Claudette Colbert from taking it.  That role was inspired by an incident which befell Elisabeth Bergner during production of The Two Mrs. Carrolls.  Two years after this film came out, a group of Chicagoans which included the mother of Nancy Reagan began giving out prizes modeled on the Sarah Siddons Award.  After the shoot, Garry Merrill, who played Bill Sampson, married the star, while the actress who played Miss Casswell, a young Marilyn Monroe, became famous.  Written by Joseph Mankiewicz, it is about a young actress who worms her way into the life of Broadway star Margo Channing.  FTP, name this 1950 film which was nominated for 14 Academy Awards, including Best Actress nominations for Anne Baxter and Bette Davis.
One of the main roles in this film had to be recast after an accident on the set of Three
All About Eve