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TOPSHOT - Britain's Prince William, Duke of Cambridge carries his newly-born son, Britain's Prince Louis of Cambridge from the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP via Getty Images)

TOPSHOT - Britain's Prince William, Duke of Cambridge carries his newly-born son, Britain's Prince Louis of Cambridge from the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP)        (Photo credit should read BEN STANSALL/AFP via Getty Images)