[1] She is daughter of Felipe Juan Luis de Osma Berckemeyer, Executive and Central Commercial Manager of Hermes Transportes Blindados, a Peruvian cash management firm, and wife Elizabeth María Foy Vásquez, a former model.

[3][4] De Osma met Prince Christian of Hanover in 2005 when she served as his tour guide when he was vacationing in Peru.

They married religiously in a Catholic ceremony at the Basilica of San Pedro in Lima, Peru, on 16 March 2018.

[7][6] The couple lives in Madrid, near the sports and social club Puerta de Hierro.

[11] Alessandra gave birth to twins on 7 July 2020 at Quirón Clinic in Pozuelo de Alarcón, Madrid.