The music moguls kick off an N.Y.C. event with a show of solidarity. Plus: Brad & Angelina, Mary-Kate Olsen and more

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PURPLE REIGN

Prince escorts two model citizens down the purple carpet Tuesday to attend The Golden Age of Couture VIP fund-raising gala at London's Victoria & Albert Museum. The exhibit, of Paris and London fashions from the 1940s and '50s, will be on display through January.