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LIFE with Jackie Kennedy: Birth of a Legend

Not originally published in LIFE. Jackie Kennedy at a formal dinner, 1960.

LIFE with Jackie Kennedy: Birth of a Legend

On what would have been Jackie Kennedy's 83rd birthday (she was born July 28, 1929), LIFE.com offers a selection of pictures — none of which ran in LIFE magazine — of the woman who at the time was celebrated as the model of an utterly new type of American woman.