Emma Watson is partnering with eco-friendly fashion label People Tree again—she designed a fall collection for them—and their new collaboration is getting the royal treatment during fashion week! On September 12th, Watson will debut the Spring 2011 collection during a fashion show held at Prince Charles's private gardens—specifically the historic Friary Court of St. James Palace. The show is just one part of the 12-day Garden Party to Make a Difference—a series of cultural events to promote sustainable living organized by the Prince's charities. Although Watson won't be able to attend, she's filmed a special video introduction. "I think the Prince of Wales' initiative is such a brilliant idea and I'm thrilled," she said.