The awards will be held at Dunedin's Lion Foundation Arena on March 13.
Flynn is the co-presenter of TV3's Sunrise programme and Heslop is its weather presenter.
The night will showcase the work of 28 designers who have travelled from throughout New Zealand and the world to take part.
Tickets have also sold out to the main show at the Dunedin Railway Station on March 14.
The Jewellery Cocktail event on March 12 is also a sellout.