Charlotte is the first princess who won't be overtaken in the line of succession by a younger brother.
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Britain's Princess Charlotte celebrates third birthday
Princess Charlotte -- now the middle child of Prince William and Catherine, Duchess of Cambridge -- celebrated her third birthday on Wednesday, nine days after the arrival of the newest addition to the British royal family.
How Princess Charlotte, 2, just made royal history
Move over, #RoyalBaby. Princess Charlotte, not even 3, has just made history.
