Evanna Lynch, who played the off-beat Luna Lovegood in the Harry Potter films, showed off her love of the Capitol (if not of pants) during LeakyCon 2012.
LeakyCon is an annual gathering of Potter fans. Since 2009 it has been hosted by a different city each year. Lynch wore her Katniss cosplay during the opening ceremony to the 2012 con in Chicago, Illinois. There are more photos over at HungerGamesFandom.Net!