What is Guillaume, Hereditary Grand Duke of Luxembourg?
{{Infobox royalty | name = Prince Guillaume | title = [[Grand Duke of Luxembourg#Succession|Hereditary Grand Duke of Luxembourg]] ([[Guillaume, Hereditary Grand Duke of Luxembourg#Titles and style|more]]) | image = Guillaume av Luxemburg.jpg | caption = The Hereditary Grand Duke in 2013 | succession = | moretext = | reign = | coronation = | cor-type = | predecessor = | regent = | reg-type = | successor = | suc-type = | birth_date = {{Birth date and age|1981|11|11|df=y}} | birth_place =[[Grand Duchess Charlotte Maternity Hospital]], [[Luxembourg City]], Luxembourg | spouse = {{marriage|[[Countess Stéphanie de Lannoy]]| 19 October 2012}} | issue =Prince Charles of Luxembourg Prince Francois of Luxembourg | full name = Guillaume Jean Joseph Marie | house = Luxembourg-Nassau (official) Bourbon-Parma (agnatic) | father = [[Henri, Grand Duke of Luxembourg]] | mother = [[María Teresa Mestre y Batista]] | religion = [[Roman Catholicism]] | signature = }} '''Prince Guillaume, Hereditary Grand Duke of Luxembourg''' (''Guillaume Jean Joseph Marie''; born 11 November 1981), is the [[heir apparent]] to the crown of [[Luxembourg]] since his father's became grand duke in 2000. ==Early Life and Education== Prince Guillaume was born on 11 November 1981 at the Grand Duchess Charlotte Maternity Hospital in Luxembourg City and is the eldest child of Grand Duke Henri of Luxembourg and his wife, Cuban-born Grand Duchess Maria Teresa. His godparents are Princess Marie Astrid of Luxembourg and Prince Guillaume of Luxembourg. Guillaume has four younger siblings: Prince Felix, Prince Louis, Princess Alexandra and Prince Sebastien. On 26 April 2012, the court announced the engagement of the Hereditary Grand Duke to the Belgian [[Stéphanie, Hereditary Grand Duchess of Luxembourg|Countess Stéphanie de Lannoy]].<ref>{{Cite news |url=http://www.wort.lu/fr/view/guillaume-et-stephanie-se-fiancent-demain-4f98eec3e4b01701472f8daa |title=Guillaume et Stéphanie se financent demain |date=27 April 2012 |access-date=26 April 2012 |publish