Blake Lively has swapped out her signature long blond locks for a black pixie haircut in a new teaser photo for her upcoming spy thriller “The Rhythm Section.” On Sunday, the actress took to Instagram to reveal the new do, with the simple caption: “#TheRhythmSectionMovie.” Reed Morano is directing “Rhythm Section,” the first film in what’s intended to become a franchise with “James Bond” producers Michael G. Wilson and Barbara Broccoli producing.