Prince Charles and Duchess of Cornwall sent Prince Louis a special message in aid of his fourth birthday which he celebrated on Saturday.
MORE: Prince Louis' star jumper in new birthday portraits is so adorable
Taking to their official social media accounts, Charles and Camilla reposted a stunning collection of images of the birthday boy playing on a beach that were taken by his mother, the Duchess of Cambridge.
WATCH: Unseen photos of George, Charlotte and Louis
They accompanied the photo with this message: "Happy 4th Birthday Prince Louis," with a birthday cake and balloon emoji.
PHOTOS: Prince Louis is turning 4! See the young royal's milestone moments in photos
MORE: Prince Louis to join Prince George and Princess Charlotte 'at new Berkshire school' – details
Royal fans couldn't wait to weigh in on the sweet post. One follower wrote: "Prince Louis is all grown up and is such a cute boy, happy birthday to him."
Charles and Camilla took to Twitter to share the update
A second penned: "Prince Louis looks remarkably mature and lovely!" Another royal fan wrote: "A very happy birthday cute and beautiful prince and God bless the Royal family."
The joyful photos were taken by avid photographer Kate, who shared the snaps alongside her husband Prince William on their joint Instagram account on Friday and Saturday.
In the photos, Louis looked cuter than ever as he donned a grey woolen jumper with three stars on the front, under the jumper he wore a checked collared shirt and the outfit was completed with turquoise shorts.
Louis looked rather sportsmanlike © The Duchess of Cambridge
On Saturday, William and Kate shared a close-up smiley snap of Louis as well as a happy snap of the four-year-old holding an orange cricket ball.
Captioning the photo the royal couple wrote: "Thank you for all the lovely birthday messages for Prince Louis today! [Photography] The Duchess." Fans couldn't get enough of the candid photos and replied with their birthday messages for the Prince.
One fan wrote: "Aw I love these pictures! Look at his big smile. I hope he is having a super fun day surrounded by his loved ones."
A second penned: "What a handsome young lad little ball of energy, Happiest Birthday Prince Louis."
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity and royal news delivered directly to your inbox.