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

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">Future king and queen, George, Duke of York, and Elizabeth, Duchess of York, holding their first child, future Monarch Princess Elizabeth at her christening ceremony in May 1926. (Central Press/Getty Images)</span></div>
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.

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.

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