Prince Sébastien Henri Marie Guillaume of Luxembourg was born on 16 April 1992 on his father's 37th birthday in Luxembourg. He is the fifth child, and youngest son of the Grand Duke and Grand Duchess of Luxembourg. He has four older siblings, three brothers and a sister: Guillaume, Félix, Louis and Alexandra. At present, he is forth in line for the Luxembourg throne, after his three older siblings-his brother Prince Louis gave up his rights to the throne in 2006.
He attended St. George's International School Luxembourg, Summer Fields School, Ampleforth College and the International School of Luxembourg, where he earned the International Bacclautate in 2011. Currently, he attends university in the United States where he prepares a bachelor in "Marketing and Communication."
Prince Sébastien fluent in Luxembourgish, French, German and English, and also has knowledge of Spanish.
When he is not attending to his education, he attends official events in Luxembourg. He is patron of the Federation of Luxembourg Swimming and Lifesaving. He is also an active sportsman, he also participates in rock climbing, skiing, swimming and rugby. At his university, he participates in his rugby team and is a holder for Luxembourg's National Team. He is also a passionate traveler and art lover.