Previously we told you there was to be an open casting call in the coming weeks for the roles of young Tom Riddle as well as Lavender Brown for the upcoming Harry Potter and the Half-Blood Prince film. MTV now has an article online quoting director David Yates about his quest to cast the perfect person to play Lavender Brown, the girl who will capture WON-WON's fancy in the sixth Harry Potter film. The director has a test in mind, and it involves...snogging.