Princess Charlotte's adorable reaction to Prince Louis's antics during rare appearance

was spotted having an adorable reaction to her brother 's cheeky antics during a rare pubic appearance last year.

Prince George, 11, Princess Charlotte, nine, and Prince Louis, six, joined their parents at the Christmas carol service organised by the Princess of Wales at Westminster Abbey in London in December 2023.

Although they all appeared on their best behaviour, with fans delighted by their appearance, Louis couldn't help but get up to his cheeky antics as he stood alongside his siblings holding candles.

Louis was caught blowing out his big sister's candle - with the nine-year-old erupting in laughter.

The service was focused around a cause close to Princess Kate's heart, after she launched the Shaping Us campaign in January 2023.

Despite her cancer diagnosis earlier this year - and having completed her treatment back in September - Kate is said to be planning on hosting another Christmas carol service next month.

The royal has already held two meetings at Windsor Castle as she prepares for her gradual return to work. During one of them, it is understood she discussed plans for the festive concert at Westminster Abbey.

The service would mark the fourth year Kate has , which will air on ITV on Christmas Eve after being filmed earlier in the month.

Royal expert Jennie Bond told : "This will obviously be a very special carol concert for Catherine and the whole family. They will be so proud to see her back taking a leading role in one of her very own projects, and I imagine that as many members of the Royal Family as possible will join her this year."