Lynda Topp is set to marry her fiancee, Donna Luxton, at a ceremony in South Canterbury this month.
Exclusive rights to the wedding have been granted to a women's magazine, but details are starting to leak out.
While gay marriage has not yet been legalised, it's understood the couple will join in a civil union and consider it a marriage.
Timaru band Coyotes are to play and the event will be held at the couple's shared business, Topp Lodge, in Staveley, northwest of Ashburton, which offers fully licensed functions for up to 80 people.
Topp, of Topp Twin fame with sister Jools, and Ms Luxton set up the accommodation so they can have bed-and-breakfast guests whom Topp can take on hunting and fishing trips, the New Zealand Woman's Weekly reported in 2010.