Bettel got married to his gay partner, Gauthier Destenay, on Friday in a private ceremony at the capital’s town hall. The couple is among the first to benefit after the country changed its laws to allow gay marriage last year.
The union comes after Iceland’s ex-PM Johanna Sigurdardottir married her same-sex partner in 2010 while in office.
In December 2013 Bettel formed came into power as Luxembourg’s first openly gay PM.
He defeated conservative PM Jean-Claude Juncker in 2013 after Juncker’s almost two decades in power.
Bettel announced that he and Destenay, an architect, would be getting married just months after lawmakers approved the amendment in June 2014.
“I could have hidden it or repressed it and been unhappy my whole life,” Bettel reportedly told a Belgian broadcaster the night before the nuptials. “But I told myself that if you want to be a politician and be honest in politics, you have to be honest with yourself and accept that you are who you are.”
Former Belgian PM, Elio di Rupo, was the EU’s first openly gay national leader.
Luxembourg was previously a conservative Catholic country but many things have changed in recent years, in part due to the high number of immigrants and foreign workers.