Actress Emma Watson has chosen to unveil the latest additions to her eco-friendly People Tree clothing collection at Prince Charles’ A Garden Party To Make A Difference which runs September 8-19. Visitors to the event will get a sneak peek at Watson’s collection which hits the shops in Spring 2011.

“I’m so thrilled that People Tree will be showing the spring-summer collection at the garden party,” the 20-year-old told the London Evening Standard. “I think the Prince of Wales’s initiative is such a brilliant idea and I’m thrilled.”

Launched in February, Prince Charles’ Start Initiative aims to help people across the UK lead more sustainable lives.

A Garden Party To Make A Difference will be held on the grounds of the Prince’s Clarence House and will feature musical performances, comedians, and environmental experts.