When Prince Danilo falls in love with American dancer Sally O'Hara, his uncle, King Nikita I of Monteblanco, forbids him to marry her because Sally is a commoner. Thinking she has been jilted by her prince, Sally marries wealthy Baron Sadoja. When the elderly man dies suddenly, Sally must be wooed all over again by Danilo.
Mae Murray
as Sally O'Hara - The Merry Widow
John Gilbert
as Prince Danilo Petrovich
Roy D'Arcy
as Crown Prince Mirko
Josephine Crowell
as Queen Milena
George Fawcett
as King Nikita
Tully Marshall
as Baron Sadoja
Edward Connelly
as Ambassador
Joan Crawford
as Ballroom Dancer (uncredited)
Sidney Bracey
as Danilo's Footman (uncredited)
Albert Conti
as Danilo's Adjutant (uncredited)
Xavier Cugat
as Orchestra Leader (uncredited)
Dale Fuller
as Sadoja's Chambermaid (uncredited)
