Happy birthday to Prince George, who is the third in line to the throne and the oldest Cambridge kid.

On Thursday, the Duke and Duchess of Cambridge posted a new image on their Instagram account to mark the occasion.

“George is turning 9!” was written in the caption, which also featured the emojis for a birthday cake and a balloon.

While the family was on holiday in the UK earlier this year, the Duchess of Cambridge took this image of the young royal, who is seen beaming from ear to ear. The sandy beach is where the photo was taken.

However, it’s his remarkable resemblance to Prince William that has admirers and followers taking notice. The Queen’s great-grandson featured in the picture wearing a light blue JCrew polo shirt.

What a wonderful image! One follower commented on the Instagram image. I can’t help but compare George to his father.

He looks exactly like William to me, another person said, and royal fans kept noticing the resemblance.

He’s starting to look more and more like his father nowadays. Amazing a baby William spitting image, one admirer exclaimed, while another added “amazing.”

As he watches his first Wimbledon tournament with parents William and Kate, Prince George presents a clean appearance.

Social media users have previously voiced their thoughts on the Prince William clone.

Fans couldn’t help but contrast Prince William’s public engagements with his younger sibling Prince George’s increased public appearances earlier this year for the Queen’s Platinum Jubilee celebrations.

They were both wearing identical navy suits when they greeted guests at Cardiff Castle in Wales and were spotted together at the Platinum Party at the Palace event during the central Platinum Jubilee weekend.

They made an appearance on the Buckingham Palace balcony after the Trooping the Colour ceremony, which many people compared to Prince William’s in 1990 when he was eight years old.

Someone commented on Twitter when George was born, “Love how George is Prince William’s little mini-me.”

Someone another said, “Doesn’t His Royal Highness Prince George look just like His Royal Highness Prince William?”

Another observed, “George is Wills’ spitting image.”

While it is inevitable that the newborn royal will share some genetics with his father, Prince George resembles his father greatly at the same age and has nearly comparable blonde haircuts.

The fact that Prince William has been famous since he was a baby and that the public has access to a library of previous photos to examine further emphasizes the remarkable similarity.

As they celebrate Prince George’s ninth birthday with a new photo that strikingly resembles Prince William, we examine all the times the father-son combo had the exact same facial traits.