Neil Patrick Harris is leaving town just as his movie, “The Smurfs,” debuts in theaters. [Maybe he had a premonition of Lou Lumenick‘s zero-star review] Harris and his boyfriend, David Burtka, told guests at a dinner party hosted by Gilt Groupe they were taking off for the South of France this weekend with their twins, Harper and Gideon. Sources said they planned to meet up with Elton John, David Furnish and their son, Zachary, for a play date. Gilt Groupe was celebrating the launch of its menswear site Park & Bond at The Dutch with guests including Gilt’s John Auerbach, Susan Lyne, Kyle MacLachlan and Jason Binn.