Happy 87th Birthday, Queen Elizabeth!
10 iconic photos to showcase the glorious reign of Her Majesty Queen Elizabeth II
87 years after her birth, Queen Elizabeth follows Queen Victoria as the longest-reigning monarch in British history. Should she remain on the throne through September 9th, 2015, Queen Elizabeth will surpass her great-great grandmother reign, according to Sky News.
Her Majesty chose to celebrate her birthday "in private" at Windsor Castle today, where the Duchess of Cambridge will attend the National Review of Queen's Scouts.
Prince Harry, meanwhile will hand out winners' medals at the London Marathon.