Same-sex marriage now officially legal in Northern Ireland.

Thousands marched for same-sex marriage on June 13, 2015 in Belfast, Northern Ireland. (Image: Charles McQuillan/Getty)

Equal marriage has finally become legal in Northern Ireland, with same-sex couples able to register to marry for the first time from Monday, January 13.

Couples can now officially give notice of their intent to form the first same-sex civil weddings…