Kate Middleton's childhood photo with her mom Carole Middleton is going viral.

The photo was shared on Prince William and Kate Middleton’s official Instagram and Twitter handles.

Fans can't stop gushing over the adorable photo of the Duchess of Cambridge.

Kate is seen holding her mom's hand in the photo and wearing a white dress and red shoes.

The photo was shared on the occasion of Mother's Day in the United Kingdom.

The Royal couple also shared a photo of a cake made by their children to honor Princess Diana on Mother's Day.

The caption read, "Celebrating two other special mothers today," followed by a heart emoji.

The photo of Kate's childhood is never-before-seen, adding to its appeal.

The sweet tribute to Princess Diana by the Royal couple's children adds to the touching Mother's Day post.