Gabriel Giacomelli's alleged relationship with Princess Leonor made international headlines, especially in Europe. Information about their relationship — and, subsequently, Giacomelli himself — was first leaked in the German magazine Bunte. He is one year Leonor's senior, at 18 years old. Though he comes from money, he's not a millionaire himself, per se (at least, not yet). His parents, who have found success in their respective fields, hold all the wealth. His father is an investment banker at Deutsche Bank in Germany, while his mother works in advertising. They hail from Brazil, while Gabriel himself grew up in New York.

According to Bunte, Gabriel attended an elite boarding school in Brooklyn before moving to the U.K., where he played soccer and lacrosse and immersed himself in art. Because of his parent's worldliness and his own globetrotting, he's picked up several languages. In addition to Portuguese, his mother's native tongue, he also speaks English (like Princess Leonor) and some German.