On the eve of his ninth birthday this coming Friday, Prince William and Kate Middleton's eldest son, George, showed off a sly grin in a new portrait .

β€œGeorge is turning 9! ” the proud parents captioned the sweet snap, which was taken by the Duchess of Cambridge herself.

The young prince looked very like his father in the beach photos, right down to the powder blue collared shirt and the hair parted to the side.

Every year on George's, Princess Charlotte's, and Prince Louis's birthdays, William and Kate share a brand-new portrait of their three children.

People immediately saw the resemblance between Princess Charlotte and the future king when a portrait of her seventh birthday was released this year,

A month ago, the prince carried that same sly grin to Wimbledon, where he once again became the center of attention due to his zany facial expressions.

The young prince wore a blue suit to match his parents at the prestigious tennis event, but he couldn't keep his cool for long.

When Prince William attended his first Wimbledon match with Princess Diana in 1991, he was 40 years old, the same age as his eldest son.