Her Majesty is honoring her grandson, Prince William, in the best way possible on his very special day.

Today, the Duke of Cambridge is celebrating his 40th birthday. To commemorate the occasion, Queen Elizabeth shared a sweet post on Instagram. The photo slideshow featured numerous photos of the pair together throughout the years.

In the first pic, William can be seen smiling brightly from Buckingham Palace at the tree lighting event which happened during the queen’s Platinum Jubilee. Another photo featured a much younger William, sporting a striped shirt and denim overalls. And the following snapshot revealed the grandma-grandson duo standing side-by-side with radiant smiles on the balcony at Buckingham Palace.

“Happy 40th Birthday to The Duke of Cambridge!” the caption read.

The birthday tribute posted by the queen is a very revealing one, to say the least. Her Royal Highness is smiling brightly in every joint picture, which gives insight into the love she has for her grandson. The numerous snapshots she chose to post reveal their close-knit bond (she shared multiple pictures where they are clearly enjoying themselves instead of opting for a single image as with past birthday tributes). Just by scrolling through the photo slideshow, it’s clear that the two have a genuine bond and care for one another deeply.

But that wasn’t the only heartfelt message William received on social media. Earlier today, Prince Charles also posted a special birthday tribute to his son on Instagram. The array of photos showed various moments shared between the father-son duo throughout the years, truly highlighting their close relationship. “Wishing The Duke of Cambridge a very happy 40th birthday!” the caption read, alongside a cake and red balloon emoji.

Happy Birthday, Prince William!

Stay up-to-date on every breaking royal family story by subscribing here.