Four once controversial portraits of the Queen have been given the royal seal of approval and are on show for the very first time.
The pictures, painted by pop artist Andy Warhol, were bought to mark the Diamond Jubilee and fittingly they are sprinkled with diamond dust.
Royal Correspondent Tim Ewart reports from the exhibition at Windsor Castle.
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The retrospective is so in-demand the museum will open its doors all through the night for the first time since it opened in 1857.