Her Royal Highness has entered the double digits! Kate Middleton and Prince William have shared a new photo of their daughter Princess Charlotte to mark her 10th birthday on Friday. “Happy 10th Birthday Princess Charlotte!

"Happy May Day," the couple's team wrote below the video Kate Middleton and Prince William are teasing their next project. On May 1, the Prince and Princess of Wales' office at Kensington Palace posted a mysterious new video to their social media accounts.

Kate and William's relationship quickly progressed, and the two began living with each other and friends Fergus Boyd and Olivia Bleasdale in a four-bedroom apartment near the town center. A friend of Middleton's said she didn't see the arrangement as being a "big deal," noting, "He has a large circle of friends, and she is just one of them."