US actor Neil Patrick Harris continued his family tradition of dressing up impeccably on Halloween as iconic film and TV characters this year, in a family portrait saluting Batman. Harris himself dressed up as The Riddler while his partner David Burtka donned a Jack Nickleson-era Joker, while their twins Gideon and Harper dressing up as the Caped Crusader and Batgirl respectively. Last year, the family paid homage to Alice in Wonderland, and the year before as Wizard of Oz.