St. Johns was married three times and had four children. Her first marriage was to Los Angeles Herald chief copy editor William Ivan St. Johns, whom she married in 1914. They had two children, Elaine and William Ivan, Jr. before divorcing in 1927.   The following year, she married one-time Stanford University football star Richard Hyland . They had one son, Richard, and divorced in 1934.  St. Johns' third marriage was to F. Patrick O'Toole, an airline executive. They married in 1936 and divorced in October 1942.  After her third divorce, St. Johns adopted a son as a single parent.