Aristotle Onassis and Maria Callas 'couldn't live without the other one,' his longtime personal secretary Kiki Feroudi ...

Inside the tragic love triangle between Maria Callas, Aristotle Onassis, and Jackie Kennedy that spoiled three lives ...

Aristotle Onassis and Maria Callas "couldn't live without the other one,” Kiki Feroudi Moutsatsos recalls Hulton-Deutsch Collection/CORBIS/Corbis via Getty Aristotle Onassis and Maria Callas When ...

“They couldn’t live without the other one,” Kiki Feroudi Moutsatsos, Onassis’ longtime personal secretary, tells PEOPLE. Once their affair began, she says, they "never stopped seeing each ...

New details the most mysterious love triangles of the 20th century, that of Aristotle Onassis Maria Callas and Jackie Kennedy ...

According to his longtime secretary, confidant, and friend, Kiki Feroudi Moutsatsos, Onassis had a decade-plus-long affair with famous opera singer Maria Callas. The performer and businessman were ...

Tessa Petak is a Brooklyn-based writer who helps to cultivate InStyle's illustrious news coverage across a wide range of topics including celebrity, fashion, and entertainment. She also produces ...

According to his longtime secretary, confidant, and friend, Kiki Feroudi Moutsatsos, Onassis had a decade-plus-long affair with famous opera singer Maria Callas. The performer and businessman were so ...

Aristotle Onassis' longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE about his affair with Maria Callas Central Press/Getty; Ron Galella/Ron Galella Collection via Getty; Len ...