37 adorable photos to mark Prince William's 37th birthday

Happy birthday, Prince William!

The Duke of Cambridge is celebrating his 37th birthday on Friday, June 21st. The royal family has marked the celebrations with a series of various Instagram posts, including throwback shots of the young prince with his parents, smiling with Queen Elizabeth, and on a royal tour of Kenya to raise environmental awareness.

In honor of the royal father-of-three's special day, we're celebrating with a roundup of the prince's cutest and most memorable moments over the years. From adorable snapshots of Prince William with Princess Diana, to his primary school days and his path as the future King of England, we've caught it all on camera.

Scroll through above to see our favorite photographs of the duke!

Related: Most adorable photos of the Cambridge family