Catherine Zeta-Jones gave well-placed fans at her Broadway show, “A Little Night Music,” a little something to remember by inadvertently flashing her boobs onstage. Zeta-Jones stars with Angela Lansbury in the revival. In one scene, her character is reunited with her long lost lover and opens her kimono to show him what he’s been missing. But audience members on the left side of the orchestra the other day also got a spectacular view. One told us, “I couldn’t believe it. No wonder Michael Douglas looks so happy. The couple sitting next to me also saw it and poked each other.” Expect a rush for left-orchestra seats.