She is also godmother to the couple's youngest daughter, 11-year-old Princess Ariane. A Dutch government spokesperson told Dutch NOS TV that her death appeared to be suicide.
The youngest sister of Queen Maxima of Holland has been found dead in her apartment in Argentina's capital.
Dutch Prime Minister Mark Rutte wished the Queen and her family, "all the strength needed to carry this bad loss". Our thoughts and prayers are with the Queen and her family. I wish them all the strength necessary to carry this terrible loss together. I trust that they will be afforded the space and privacy they need'. The government said state visits to Latvia, Estonia, and Lithuania will go ahead as scheduled, but King Willem-Alexander will not be joined by Maxima.
Her body was found Wednesday night by her mother María del Carmen Cerruti and a friend of Zorreguieta, said news agency EFE.
Dutch Princess Ariane is carried by the sister of Queen Maxima to her baptism ceremony in the Kloosterkerk in The Hague on October 20, 2007.
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King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands during the official picture at the state banquet in the Grand Ducal Palace on May 23, 2018 in Luxembourg, Luxembourg.
It's believed Zorreguieta took her own life.
Zorreguieta was a psychologist who worked on social policies at the office of Argentina's president, Mauricio Macri.
Between 2009 and 2011 she worked at the United Nations headquarters of Panama but returned to Argentina in 2012 after a breakup. Argentinian authorities are still investigating the 33-year-old's death but they too have pointed to suicide.