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European Royal Families Attend A Festive Reception At Het Loo Palace In Apeldoorn To Celebrate The 40Th Birthday Of Crown Prince Willem Alexander Of Holland.Crown Prince Willem Turned 40 In April 2007. . (Photo by Julian Parker/UK Press via Getty Images)

European Royal Families Attend A Festive Reception At Het Loo Palace In Apeldoorn To Celebrate The 40Th Birthday Of Crown Prince Willem Alexander Of Holland.Crown Prince Willem Turned 40 In April 2007. . (Photo by Julian Parker/UK Press via Getty Images)