See photos of Queen Elizabeth through the years in honor of her 91st birthday

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Thursday, April 21, 2016

Happy Birthday, Queen Elizabeth II! The longest-reigning British monarch turns 91 years old on April 21, 2017.

The queen's birthday is marked twice a year, once when she was born (in April) and once on the "official" birthday in June, when there is a parade.

The royal family celebrated the day on social media by sharing photos of the Queen through the years.

Now the oldest reigning monarch, she dedicated her life to service on her 21st birthday. More > https://t.co/mcVCkOE7UY #QueensBirthday pic.twitter.com/chSdUWfARJ
— The Royal Family (@RoyalFamily) April 21, 2017

To mark The Queen's 91st birthday, we are sharing this photo from 1952 of Her Majesty and The Prince of Wales. #HappyBirthdayHerMajesty pic.twitter.com/ednBFygYue
— Clarence House (@ClarenceHouse) April 21, 2017

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.

PHOTOS: Prince William and Princess Kate

PHOTOS: Kate Middleton shows off baby bump

See photos of Kate Duchess of Cambridge and Prince William, their children Prince George and Princess Charlotte and the whole royal family through the years.