High Quality Content by WIKIPEDIA articles! "Belles de Jour" is the 66th episode of the CW television series, Gossip Girl, as well as the season premiere of the show`s fourth season. The episode was written by Joshua Safran and Stephanie Savage and directed by Mark Piznarski. It originally aired on Monday, September 13, 2010 on the CW. The episode filmed several scenes in Paris, a move that was heavily promoted by the show`s network and commended by critics. A promotional video entitled "Oh Mon Dieu" used a French rendition of Nancy Sinatra`s "These Boots Were Made For Walking" to advertise the season premiere.