Prince Louis melted hearts as he sweetly held hands with Mia Tindall during the Royal family's traditional Christmas Day walk to church at Sandringham.The young prince was seen wearing tartan trousers and a blue pea coat as he held onto his dad Prince William and Mia Tindall, the oldest daughter of Mike and Zara Tindall. Louis looked thrilled to be walking with his cousin as both had red cheeks from the cold and flashed grins at waiting royal fans.