 A rare royal appearance overseas. I'm Vicki Barker in London. Wait until the crowds see her. Just before the Wimbledon men's final. The princess of Wales. Kate got a standing ovation as she arrived with daughter Charlotte and sister Pippa. Kate wore a short-sleeved purple dress and a broad smile, acknowledging the cheers. This was only her second public appearance since her announcement in March that she's being treated for an undisclosed form of cancer.