Elizabeth II is a person.
Elizabeth II ( Elizabeth Alexandra Mary ; born 21 April 1926 ) has been Queen of the United Kingdom , Canada , Australia , and New Zealand since 6 February 1952 . In 2015 , she surpassed the reign of her great-great-grandmother , Queen Victoria , to become the longest-reigning British monarch and the longest-reigning queen regnant and female head of state in world history .