The shared Instagram account for Kate Middleton and Prince William welcomed a trio of guest posters Sunday, when children Prince George, Princess Charlotte, and Prince Louis took the platform over. The occasion: Father's Day, with a post in tribute to their dad, the Prince of Wales.

Kate Middleton is wishing her other half a happy birthday. In honor of Prince William turning 43 on June 21, the Princess of Wales, 43, shared a sweet snapshot on social media. Middleton posted a picture of the Prince of Wales to Instagram, showing her husband sitting in the grass holding one puppy, while the others surround him.

Prince William is celebrating his 43rd birthday. See the tributes the Royal Family shared on June 21 to honor the Prince of Wales.