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The long-time fan of all things vintage was named runner-up at the nationwide pageant held as part of the Very Vintage Day Out in Auckland.
Mackay, who had the stage name Miss Chevy Chevelle, channelled mid-20th century glamour for the event, which included day wear, beach wear, evening wear and talent sections.
In the latter section, she sang the 1950s classic Stupid Cupid. The performance involved "some stage hiccups", Mackay said.
"Firstly my microphone wasn’t turned on so I had to start [my song] again.
"I had no foldback speakers so I couldn’t hear my music, and then my confetti cannon decided it wouldn’t go off, but once it finally did at the end of my act the audience roared and cheered so loud,” she said.
"It was such a fabulous moment, totally unforgettable.”
"My highlight was definitely creating relationship with my fellow contestants.
"I was lucky enough to meet with some of the gorgeous people from the vintage community who have been supporting and following me from afar and to embrace those friendships,” she said.
Miss Pinup was Mackay’s first nationwide pageant. She was able to compete at the event after making the list of finalists.