When it comes to stopping traffic, Giorgio Armani has become quite the maestro with his steamy campaigns for Emporio Armani Underwear and Armani Jeans — and his latest efforts for Spring are likely to have women drivers slamming on their brakes.Mert Alas and Marcus Piggott shot the world’s number-one-ranked tennis player, Rafael Nadal, who strikes a traffic-stopping pose in his light-wash jeans.