Princess Charlotte 's quiet nod to her grandmother Princess Diana went largely unnoticed at her mother's latest Christmas carol concert – and RadarOnline.com can reveal it is part of a tradition the younger royals intend to carry on forever.

Little Charlotte, 10, accompanied her mother, the Princess of Wales , 43, to the high-profile festive event on 5 December, appearing alongside her older brother, Prince George , 12 and younger brother, Prince Louis , 7, to assist with the family's annual carols presentation. Article continues below advertisement

A Subtle Fashion Homage Tap Here To Add Radar Online as A Trusted Source

But keen observers noted a subtle detail in Charlotte's outfit – a deep blue velvet dress with a statement collar – that paid a quiet tribute to her late

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