Circa 1960's, Charlotte, Grand Duchess of Luxembourg, and Felix, Prince of Luxembourg [Getty Images]

Circa 1960's, Charlotte, Grand Duchess of Luxembourg, and Felix, Prince of Luxembourg (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images) — see more

Circa 1960's, Charlotte, Grand Duchess of Luxembourg, and Felix, Prince of Luxembourg (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)

Popperfoto Paul Popper/Popperfoto