Princess Laurentien of the Netherlands (born Petra Laurentien Brinkhorst, 25 May 1966)^[1] is the wife of Prince Constantijn and sister-in-law of King Willem-Alexander of the Netherlands.

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Laurentien Brinkhorst
Princess Laurentien in 2012
Born	Petra Laurentien Brinkhorst (1966-05-25) 25 May 1966 (age 57) Leiden, Netherlands
Spouse	Prince Constantijn of the Netherlands ​ ​ (m. 2001)​
Issue	Countess Eloise Count Claus-Casimir Countess Leonore
Father	Laurens Jan Brinkhorst
Mother	Jantien Brinkhorst-Heringa

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Petra Laurentien Brinkhorst was born in Leiden, Netherlands on 25 May 1966, the daughter of the former Dutch minister of Economic Affairs, Laurens Jan Brinkhorst and Jantien Brinkhorst-Heringa. She has one brother. She is known by her middle name, Laurentien, a portmanteau of her parents' given names.

Princess Laurentien started primary school in Groningen. Her family then moved to The Hague, where she completed her primary education. She attended her secondary education in The Hague, of which four years at the Christelijk Gymnasium Sorghvliet and one year at the Eerste Vrijzinnige Christelijk Lyceum, and later in Kita, Tokyo at the Lycée Français International de Tokyo, where she obtained her Baccalauréat diploma in 1984. Her father was working in Japan at the time, being the Ambassador of the European Union to Japan between 1982 and 1987.

Princess Laurentien studied history at the University of Groningen, where she completed her Propaedeutics in 1986. She then studied at Queen Mary College, University of London where she received a BA degree in political science in 1989, and subsequently at the University of California, Berkeley where she obtained an MJ degree in 1991.

In 2009, she was designated UNESCO Special Envoy on "Literacy for Development" in recognition of her "outstanding commitment to the promotion of education and her profound dedication to the Organization's ideals and objectives". In 2010 she was co-recipient of the Major Bosshardt Prize for her work in combating illiteracy.^[2]

She is also the current president of wildlife conservation NGO Fauna and Flora International.^[3]

The engagement of Prince Constantijn and Laurentien Brinkhorst was announced on 16 December 2000. The civil marriage was conducted by Wim Deetman, the mayor of the Hague, in the Oude Raadzaal, Javastraat, the Hague, on 17 May 2001. The church wedding took place two days later on 19 May in the Grote of St Jacobskerk, with Reverend Carel ter Linden officiating.

Prince Constantijn and Princess Laurentien have three children: Eloise (born 2002), Claus-Casimir (born 2004), and Leonore (born 2006).

In 2015, Prince Constantijn, Princess Laurentien, and their children moved from Brussels to The Hague.