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PARIS, FRANCE - JANUARY 25: (L-R) Bianca Jagger, Princess Alessandra Borghese and Princess Gloria Von Thurn und Taxis attend Princess Gloria Von Thurn und Taxis signs her Book 'The House of Thurn und Taxis'. Held at Librairie Galignani on January 25, 2016 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)