BEYONCÉ
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There's a reason Beyoncé's choreographer affectionately calls her ''a beast.'' ''She challenges you to come up with the best kind of movements,'' says Frank Gatson Jr., who's worked with her for 12 years, ''because she's going to bring it every time.'' That was more than obvious from her handful of electrifying live performances, and especially in the video for ''Single Ladies (Put a Ring on It).'' That amazing clip features the 27-year-old superstar dancing her butt off in what appears to be one flawless take, although director Jake Nava actually shot the video in three parts with multiple cameras on a 360-degree set.

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