The Duke of Cambridge shared the memorable image on his Twitter page.

The Duke, who is  second in line to the British throne, will turn 40 soon.

In the image, the Duke could be seen flanked by Prince George, 8, and Princess Charlotte, 7.

Little four-year-old Prince Louis could be seen perched on the shoulders of his daddy.

All the four could be seen smiling as they posed infront of the camera.

The image was shared on The Duke and Duchess of Cambridge Twitter page.

The picture was shared online with the captions that reads: "Wishing a Happy Father’s Day to fathers and grandfathers across the world today!"