7/9/2009 in 19-year-old Emma Watson experienced a wardrobe malfunction at "Harry Potter" premiere. Kathryn Jordan At least I'm wearing underwear, Harry Potter's Emma Watson told David Letterman on "The Late Show" Wednesday. The comment was in response to her wardrobe malfunction on the red carpet during the "Harry Potter and the Half-Blood Prince" premiere on Tuesday. During an absolute downpour at the premiere, Watson accidentally showed a little too much when her dress parted, exposing her underwear. Watson has made sure to make clear to the media that she is a straight-edge star in young Hollywood. After stars like Lindsay Lohan, Kirsten Dunst, and Nicole Richie have seemed to let the limelight get the best of them, Watson has done her best to let everyone know she will continue to be a good role model for her millions of fans. Clearly, her faux pas on Tuesday was especially embarrassing for the Watson party. Letterman did not mention the almost "nip-slip" Watson had in her limo approaching the premiere, giving the 19-year-old a break. Perhaps, the over-exposure caused Watson to cover up more on Letterman, where she donned a demure, modest dress.