America's sweetheart is returning to her romantic comedy -- and boxoffice green -- roots with the slated Christmas 2008 release of New Line's "Four Christmases," which Witherspoon is also producing. Her upcoming schedule remains active with the horror flick "Our Family Trouble," produced by her own Type A Films, but the hardworking actress and producer recently took a hit with the flop of New Line's "Rendition," which received more action from its behind-the-scenes romance rumors than at the boxoffice.