• Prince Louis turned 4 years old
  • His new birthday portrait has arrived
  • The young royal has really grown up

There's reason to celebrate in the British royal family: Prince William and Duchess Kate's youngest son Prince Louis is 4 years old. To mark his special day, the Palace released a super cute picture of the little royal.

Prince Louis is already that big

In the photo, Prince Louis is seen against a backdrop of sand dunes. He smiles at the camera and holds a ball in his hand. One thing that can't be missed: Louis is looking more and more like his older brother George.

The photo was taken in Norfolk earlier this month by the little prince's mum herself, Duchess Kate. "Happy 4th Birthday," the Palace wrote with the post.

Also interesting:

In the comments, royal fans responded with endless congratulations. It had also been a while since we'd seen Prince Louis.

The last few times William and Kate stepped out in public, they did so with only Prince George and Princess Charlotte.