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Prince William, Kate double date with his dad

Prince William and Kate, Duchess of Cambridge, arrive at a charity concert in London, Dec. 6, 2011. AP Photo

(CBS) The British royal family took in a night of music on Tuesday at London's Royal Albert Hall. They attended singer Gary Barlow's concert in aid of The Prince's Trust and The Foundation of Prince William and Prince Harry.

Prince William and Kate, Duchess of Cambridge, were joined by Prince Charles and Camilla, Duchess of Cornwall, at the event.

Read more: Royals treated "like rock stars" on double date
Pictures: The royals attend charity concert
Pictures: Kate, Duchess of Cambridge

Duchess Kate turned heads in her lace tulip dress, which she clearly got on the cheap. The frock can be found at Zara for only $99 (though it looks as if it already had sold out online). She completed the outfit with black tights and a familiar black blazer.

Prior to the show, Barlow, singer of British vocal pop group Take That, told Prince William, "I hope you enjoy tonight and I hope it's not too loud." William replied, "The louder the better, the louder the better."

Proceeds from the benefit will help neighborhoods affected by the August riots in London.

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