Showbiz 101

During the successful premiere of Harry Potter and the Half-Blood Prince in London, it was also the night of a sneak peek of Emma Watson's undies.

There was a heavy rain and strong wind, which makes all cast wet. But a wild wind hits one of the star, Emma Watson’s underwear accidentally flashed due to the strong wind.

But still Emma was not affected to all what happened, as she said in one interview, "At least I’m wearing an underwear".

See the photos of Emma Watson's during the premier...