Note to Britney Spears, Paris Hilton and Lindsay Lohan:

This is how you handle a wardrobe malfunction!

At Tuesday's London premiere of Harry Potter and the Half-Blood, star Emma Watson accidentally gave red carpet fans a flash of her underwear while adjusting her floor-length gown in a driving rain storm.

It's okay to peek, fellas. The actress is over 18...

Following the incident, Watson appeared on The Late Show with David Letterman and calmly, maturely addressed the mistaken peep show.

"This was a small wardrobe malfunction that happens," she said. "I actually don't remember it happening. At least I'm wearing underwear!"

Emma Watson on Letterman