Princess Charlotte sent royal fans wild tonight after she joined her brothers, Prince George and Prince Louis , to attend her mother, Princess Catherine's Christmas carol concert in London. The Waleses' only daughter looked adorable in a blue dress with an accentuated white collar.

Charlotte styled her hair in a half-updo with a big black bow. She was seen accompanying her siblings and parents, the Prince and Princess of Wales , throughout this evening's event.

However, royal fans were quick to point out one major detail about Charlotte’s appearance at tonight’s event.

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They noted on how grown up she looks and that her

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