Alessandra Ambrosio headed out to Sin City this past weekend to celebrate the grand opening of Marquee Dayclub at The Cosmopolitan Hotel. For her Las Vegas sojourn, the supermodel wore Pucci day and night. Ambrosio lounged by the pool in a blue and white Emilio Pucci tunic dress. To celebrate her 30th birthday at the Marquee nightclub, she slipped into a sexy nude cutout Pucci mini dress with metallic beading. Which look do you prefer?