Watch Princess Mary of Denmark dance the night away with Prince Frederik

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Prince Frederik and Princess Mary danced to Stevie Wonder's <em>Isn't She Lovely</em>. <br>Photo: © PA
The Crown Princess looked beautiful in a figure-hugging gown. <br>Photo: © PA
The couple are on a four-day visit to the US. <br>Photo: © PA
Mary has been upping the style stakes with each engagement. <br>Photo: © PA
The royals left their four children at home – Prince Christian, ten, Princess Isabella, nine, and five-year-old twins Prince Vincent and Princess Josephine. <br>Photo: © PA
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