The striking resemblance between the two royals sons was laid bare by avid fans on Twitter, who described how the second cousins were so similar they could be brothers.
The Royal Family welcomed their latest edition to the family last week, with Princess Eugenie giving birth to a baby boy, Ernest George Ronnie Brooksbank.
EXCLUSIVE: A royal commentator said ardent royalists would have criticised Ernest s name had the Prince and Princess of Wales chosen it, but it may have been welcomed by the younger generation.