By Jennifer Newton Princess Charlotte showed her “hero-worship” for her dad Prince William with a sweet yet telling gesture at her mum’s Christmas carol concert, according to a body language expert. The eight-year-old along with brothers Prince George and Prince Louis made a rare public for the annual Westminster Abbey event hosted by Kate which has quickly become a firm fixture in the festive royal calendar. The royal children were introduced to the Dean of Westminster, Dr David Hoyle, outside the Abbey’s great west door when they first arrived with their father William. As they walked into t…