SO LONG, farewell, to the pop of flashbulbs for some of London's over-exposed celebrities Dior glasses who in September are off to Peru, trekking up Machu Picchu. Climbing every mountain along the Inca trail are X Factor winner Alexandra Burke and musical star Denise Van Outen (pictured above). The good news is they will raise money for Breast Cancer Care by completing the trek with six women diagnosed with breast cancer.