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"Music brings us all together so it's my pleasure to be able to share that special moment with someone who has never performed onstage before," Taane said.
Tamia's father Sez Bunker submitted the video of his daughter singing Always on My Mind to Taane's Facebook page.
He told the Bay of Plenty Times his daughter was so grateful for the opportunity for Tiki Taane to hear her sing, let alone winning the competition.
"She is over the moon," he said.
The singing competition was a new aspect of the expo and organiser Chris Preece said it was to further enhance the expo's family-friendly appeal.
"We get a huge number of mums and dads bringing their children along to experience aspects of street culture not often seen all together in one place."
He said Taane epitomised what the event was all about.
"He's a family man, celebrated Kiwi musician and all-round nice guy - and he's covered in tattoos.
"The expo is about breaking down those stereotypes or expectations around tattoos, and showcasing them as an important part of our culture."
The NZ International Tattoo and Art Expo showcased the works of renowned international, national and local tattoo artists alongside graffiti artists, musicians, burlesque performers and other aspects of street culture.
The expo is on Saturday, from 11am to 10pm and on Sunday from 11am to 7pm at Queen Elizabeth Youth Centre.
Taane and Tamia would perform on Sunday at 3pm.
Tickets were $20 on the door or $35 for a weekend pass.