Princess Beatrix * Princess Margriet *Professor Pieter van Vollenhoven * Countess Leonore of Orange-Nassau, Jonkvrouwe van Amsberg (Leonore Marie Irene Enrica; born 3 June 2006), is the third child and second daughter of Prince Constantijn and Princess Laurentien of the Netherlands.

[1] Countess Leonore was born on 3 June 2006 in HMC Bronovo in The Hague, She was baptised in the chapel of Het Loo Palace in Apeldoorn on 8 October 2006.

Her godparents are her paternal aunt, Queen Máxima; her maternal uncle, Marius Brinkhorst; her father's first cousin, Juliana Guillermo; and Count Jean-Charles Ullens de Schooten Whettnall.

227, it was determined that all children and male-line descendants of Prince Constantijn of the Netherlands would bear the title of Count (ess) of Orange-Nassau (with princely rank) and the honorific Jonkheer (Jonkvrouwe) van Amsberg with the style of "His/Her Highborn Lord/Lady" and have the surname Van Oranje-Nassau van Amsberg.

Upon the abdication of Queen Beatrix on 30 April 2013, the children of Prince Constantijn and Princess Laurentien ceased to be members of the Royal House, although continue to be members of the royal family.