Sofia Vergara and her fiancé, Onion Crunch king Nick Loeb, looked cozy as they took in a Broadway show. The couple sat in the ninth row for “Nice Work if You Can Get It,” starring Matthew Broderick, Thursday night. “They looked chummy,” says an witness. “Only one couple in the row in front of them approached, and they were pleasant.” Vergara was carrying a Bergdorf’s bag, while Loeb, known to carry his crunchy topping everywhere, was empty-handed.