Delta Goodrem performs secret gig in Auckland

SYDNEY, AUSTRALIA - JULY 29: Delta Goodrem poses during the Voice Live Finals Show Launch on July 29, 2015 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)

The Voice judge Delta Goodrem is singing tonight at an exclusive Auckland hotel.

But the location of the intimate performance is top secret - with only industry insiders and lucky ticket winners invited to attend.

The gig is a promotion by iHeartRadio and pop music station ZM for fans of the 30-year-old Australian singer.

Goodrem performed in front of an audience of about 50.

Accompanied by an acoustic guitarist, and herself a playing a glossy black baby grand piano the energetic singer's powerful voice filled the room.

Wearing a long, sheer, black dress with her hair loose, Goodrem performed some of her biggest hits including List Without You, plus her new single Wings.

At the age of 15, Goodrem signed to Sony Music and released her album Innocent Eyes in 2003.

The album topped the Australian Albums Chart and reached number two in the UK.

She also dabbled with acting, playing aspiring singer Nina Tucker Aussie soap opera Neighbours.

In July 2003, at the age of 18, Goodrem was diagnosed with Hodgkin's lymphoma.

She announced she was in remission near the end of 2003, after radiotherapy and chemotherapy.