 Over in Britain, a rare royal appearance by the Princess of Wales. 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.