Prince Harry and Meghan Markle may have kept their firstborn Archie Harrison’s royal christening  on July 6 private, but that doesn’t mean fans didn’t get a glimpse of the adorable two-month-old! The new parents shared two photos from the little royal’s big day on their Instagram, @SussexRoyal, showing their little bundle dressed in the family’s traditional christening gown while posing with his parents and close family members. And all we can say is: those cheeks! “The Duke and Duchess of…