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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

<>Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

<>Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

<>Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

<>Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

<>Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Fameflynet)

Princess Diana with the newly born Prince Harry outside the Lindo Wing on September 17, 1984. (Getty)

Prince Charles, Prince of Wales and Diana, Princess of Wales leave St Mary’s Hospital with newborn baby Prince William on June 22, 1982 in London, England. (Getty)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Bauer-Griffin)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge hold their newborn son outside The Lindo Wing at St Mary’s Hospital on July 23, 2013 in London, England. (Getty)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton and Prince William leaving the hospital on July 23, 2013. (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Kate Middleton & Prince William (Courtesy Of CNN)

Princess Diana with the newly born Prince Harry outside the Lindo Wing on September 17, 1984. (Getty)

Princess Diana & Prince Charles with baby Prince William on the day of his Christening in 1982 (Getty)