Here come the brides for their big day in ACT Wow! That would be amazing!": Corrina Peck, left, and Stacey Cowan are preparing to marry in Canberra on Saturday. The Marriage Equality (Same Sex) Act 2013 might not sound like the most romantic document in the world, but it was enough to make central coast couple Stacey Cowan and Corrina Peck go weak at the knees. "I remember we were at home watching Sunrise together one morning in October when they announced it," said Ms Cowan. And we thought, 'Wow! That would be amazing!' On Saturday, Ms Cowan and Ms Peck will make history as being among the first gay people in Australia to legally marry. "For our relationship and the love we share to be acknowledged and celebrated with our family and friends is just huge," said Ms Cowan. And it will be a milestone for Australia, as well. Ms Cowan, 30, met Ms Peck, 38, two years ago, through mutual friends. "I won her heart by bringing some caramel slice to her house," said Ms Cowan, who loves to cook. The couple had thought about marriage for some time, and had even considered going to New Zealand when gay marriage was legalised there. So when they heard of the ACT's legislation, they leapt at the chance, travelling to Canberra to meet their celebrant and fill out paperwork. They began shopping for reception venues, looking for rings and, of course, clothes: a white dress and veil for Ms Peck, a hot pink shirt and white Kelly Country suit for Ms Cowan. "I been going back and forward to Sydney to get fittings for it," said Ms Cowan. The ceremony will be held in Lennox Gardens, in Yarralumla, with about 50 friends and family members watching. "The whole thing started small but the minute people heard about it, they were so happy for us they said, 'Yep, I'm comin'!'" said Ms Cowan. But not everyone is so thrilled, and the joy may be short-lived. Ros Phillips, from the Christian lobby group FamilyVoice Australia, has claimed that the ACT law not only breaches the constitution but "would not lead to equality." On Tuesday, the Commonwealth challenged the validity of the law, with Australian Solicitor-General Justin Gleeson describing marriage as "a common genus" - the union between a man and a woman - "that is not divisible into multiple species." Mr Gleeson argued that marriage was governed solely by federal law, and that the ACT legislation, if allowed to stand, would be "repugnant to the grandeur of power." The High Court has reserved its decision until December 12, leaving a narrow window of opportunity for keen same-sex couples. "There's nothing I can do about the High Court," said Ms Cowan. If our marriage becomes invalid, it will be upsetting, but at the same time, it's a milestone and it means we are one step closer. "And anyway," she added, "I'll still have at least five days of being married to my partner."