Jennifer Lopez -- What Was Your First Clue?

Posted Jul 26th 2009 12:31AM by TMZ Staff

Knock her over with a feather. Jennifer Lopez was stunned by hubby Marc Anthony's handiwork -- a surprise 40th birthday party for her last night in NYC. But here's the thing ... did Ms. Oblivious realize something was up when she noticed 47th Street was shut down?

Leah Remini, Liza Minnelli and Ricky Martin were among the crowd singing happy BD.