"This whole journey has been incredible," the Year 11 Marlborough Girls' College student said. "Can someone pinch me, please?"
She's been singing since she was a toddler, as well as playing the acoustic guitar and ukulele. Clara also has a catalogue of more than 50 original songs, mostly based on the books she reads.
"I think the music I write is really special and different," Clara said.
"It comes from the heart and I'm totally committed to it. I have my own style and to be able to share that is a beautiful thing."
After her first audition, Campbell described her as a serious talent and during the semifinals, Hunter told her she "oozed" the superstar factor. As part of her prize Clara won $100,000 and a 2013 Toyota Corolla. Her first single Where Do You Find Love? will be released before Christmas.