She may be the most famous teenager in the world, but there are still some people who have never heard of Miley Cyrus.  The Hannah Montana star — who celebrates her 17 birthday this week — and a friend visited Pop Burger on East 58th Street in New York City last week and placed their order. Much to Miley’s displeasure, the counter manager asked for her name to mark the order, The New York Post reports.“Are you serious? You don’t recognize me? I’m Miley Cyrus,” the actress snapped at the manager a PageSix spy dishes. The counterman still had no clue who she was, ran her credit card with her name on it, and shrugged. “That’s nice for you. Here is your order. Have a good day,” he added. source.