After leapfrogging to Broadway in Grease as the winner of a reality-TV casting series, Osnes has proven the snobs and cynics wrong in equally winsome turns as a spunky nurse in South Pacific, a poised heiress in Anything Goes and a gun-toting gangster in the short-lived Bonnie & Clyde. Now she hits 54 with a collection of tunes by Maury Yeston (Nine).