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American rock legend Elvis Presley with his daughter Lisa-Marie Presley. (Photo by Frank Carroll/Sygma via Getty Images)

American rock legend Elvis Presley with his daughter Lisa-Marie Presley. (Photo by Frank Carroll/Sygma via Getty Images)

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Elvis Presley with Priscilla and their four day old daughter Lisa Marie prepare to leave Baptist Hospital in Memphis, Tennessee.

Elvis Presley with Priscilla and their four day old daughter Lisa Marie prepare to leave Baptist Hospital in Memphis, Tennessee.

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MEMPHIS, TN - FEBRUARY 5: Rock and roll singer Elvis Presley with his wife Priscilla Beaulieu Presley and their 4 day old daughter Lisa Marie Presley on February 5, 1968 in Memphis, Tennessee. (Photo by Michael Ochs Archives/Getty Images)

MEMPHIS, TN - FEBRUARY 5:  Rock and roll singer Elvis Presley with his wife Priscilla Beaulieu Presley and their 4 day old daughter Lisa Marie Presley on February 5, 1968 in Memphis, Tennessee. (Photo by Michael Ochs Archives/Getty Images)

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Lisa Marie Presley, Priscilla Presley & Elvis Presley (Photo by Magma Agency/WireImage)

Lisa Marie Presley, Priscilla Presley & Elvis Presley (Photo by Magma Agency/WireImage)

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Elvis Presley's wallet containing a picture of his with daughter Lisa Marie, part of "Elvis at the O2 - Direct from Graceland" exhibition in London. Elvis at the O2 is the largest Elvis retrospective ever mounted in Europe. (Photo by Zak Hussein/Corbis via Getty Images)

Elvis Presley's wallet containing a picture of his with daughter Lisa Marie, part of "Elvis at the O2 - Direct from Graceland" exhibition in London. Elvis at the O2 is the largest Elvis retrospective ever mounted in Europe. (Photo by Zak Hussein/Corbis via Getty Images)