Grace Millane's family is desperately trying to reach the 22-year-old after she didn't return to her room in the Auckland hostel six days ago.
Originally from Essex, she travelled to the North Island city two weeks ago but alarms bells rang when she failed to respond to birthday well-wishes early this week.
The CCTV image, taken at Auckland's Sky City entertainment complex, was taken at 7.15pm on Saturday and is the last known sighting of her.
Detective Inspector Scott Beard, of Auckland City Police, said Grace's father was on his way to New Zealand, and said her family were understandably "distraught".
He added: "Clearly this is a very stressful time for Grace's family and the longer she remains missing, the more our concern grows for her safety and wellbeing."
Her brother Michael said Grace had been missing for six days after failing to return to her room, and police were now scouring social media and CCTV for clues.
Their father, millionaire property developer David Millane, has also flown out to New Zealand to help with the search.
Michael added: "Thursday was the last time we spoke to Gracie, we speak daily. We're still appealing for information."
He also posted a public appeal on Facebook, imploring those who read it to share it across community groups.
He wrote: "She has not returned to her hostel room in Auckland New Zealand and family members have had no contact since Saturday 1st December.
"The Embassy have been contacted. Please share and contact if you have any information regarding her whereabouts."
Grace had been staying at the Base Backpackers on Queen Street, a popular accommodation provider in the centre of the city.
According to the NZ Herald, there was no evidence of foul play and her belongings remained in her hostel room.
DI Beard said they were still trying to reach several people she had been with on Saturday night.
"The longer this goes on, the more worrying it is. At this stage we're hopeful we will find Grace."
A person claiming to have seen Grace also spoke with the New Zealand paper – saying she spotted Grace at the Manukau on-ramp – roughly 14miles from Sky City.
She said: "Where she was standing, it was really bizarre and she was by herself, nobody around just a girl on her own.
"I can honestly 100 per cent say I saw a young girl, absolutely so close to her description that it's not funny, and there was no way I was going to stop.
"She was in a very unusual place to stand, I would have thought a hitchhiker would have stopped on the left-hand side to get in the car, she was on the other side."
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