Happy Birthday, Queen Elizabeth! See photos of Britain's longest reigning monarch through the years

Happy Birthday, Queen Elizabeth II! The British monarch turns 94 years old on April 21, 2020.

Check out the gallery above to see how Queen Elizabeth II has changed from her days as Princess Elizabeth, to ascending the throne in 1952, to today.

SEE ALSO: Queen Elizabeth gives rare address as UK sees record spike in coronavirus deaths

PHOTOS: Prince William and Kate

See photos of Prince William, Princess Kate, Prince George, Princess Charlotte and all of the royal family.