Even the best dancer in Hollywood makes missteps on the dance floor. During her performance of "Louboutins" at the 2009 American Music Awards, J.Lo was supposed to jump off a human pyramid of half-naked male backup dancers. But as she was landing, she lost her balance and fell square on her butt. (Thank goodness for her ample bottom!) Still, she got right back up and kept going. Go, J.Lo!