United Kingdom, June 23 -- Emma Watson once mistook a group of birdwatchers for paparazzi.

The Harry Potter star, 36, was convinced her family home had become a target for photographers trying to snap her picture when she saw a group of people standing outside armed with cameras and long lenses - but Emma soon found out they were just trying to capture images of a rare bird and weren't interested in her at all.

During a speech at the United for Wildlife Business Forum in London hosted by Prince William's The Royal Foundation, Emma explained: "I was in my living room and I saw all these men outside with very long lenses. And I thought: 'Urgh today's the day it's happened. My goodness'.

"So she [my mother] went outside to address them an...