In this undated photo provided by American Ballet Theater, David Hallberg and 

In this undated photo provided by American Ballet Theater, David Hallberg and Natalia Osipova perform in "Romeo and Juliet", which will be performed by the American Ballet Theater at the Metropolitan Opera House in New York. (AP Photo/American Ballet Theater, Gene Schiavone)
Associated Press
In this undated photo provided by American Ballet Theater, David Hallberg and Natalia Osipova perform in "Romeo and Juliet", which will be performed by the American Ballet Theater at the Metropolitan Opera House in New York. (AP Photo/American Ballet Theater, Gene Schiavone)
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