STAR ACT: Members of Auckland boy band Titanium leave Nelson on Sunday after flying in for a Saturday night birthday party.

A Nelson girl had a super sweet 16 birthday party at the weekend, when New Zealand boy band Titanium was flown in as the star attraction.

The boy band, formed last year after a competition by radio station The Edge, were one of several surprises at the party for the daughter of a local businessman, at the Trafalgar Centre on Saturday night.

The party also featured performances by singer-songwriter Jamie McDell and Auckland MIXIT DJ Stephen Buckley, games and activities such as a mechanical bull, a mechanical surfboard, and a velcro wall, and food prepared by Kevin Hopgood, including a recipe by Heston Blumenthal.

IN FULL SWING: The party at the Trafalgar Centre.

Her mother, who asked for the family not to be named, said preparations for the party began last year, with the family contracting a local event planner.

The birthday girl was unaware of who the performers were, only being told there were two surprises at her party.

About 190 guests were invited. Performers were ferried to the venue by a limousine, and stayed in Monaco Resort. Guests could have their photos taken by Virginia Woolf photography, or in the Lucky Booth.

Attendees were given bracelets to indicate their age, and those under 18 were not given alcohol.

Security staff were on-hand for any difficulties, but the most dramatic event was the party being temporarily evacuated after a smoke alarm went off.

After a performance by students at Nelson's Soundstage - where the girl learns singing, dance and performance - she got on stage herself to perform a song by Ms McDell.

She was then surprised when the singer joined her.

This was followed by the main event, Titanium, who performed their hits, sang happy birthday and gave the birthday girl a bouquet of flowers.

The girl's mother said such a big party was unusual for the family, and the girl would not be getting a similar event for her 21st.

The party was in very good taste, and did not feature anything "crazy or extravagant", she said.

"All in all it was a very lovely party, most people enjoyed themselves.

"This was a party for a teenage girl turning 16."

When asked how much the party cost, the girl's mother declined to comment.

"It cost what it had to cost to organise everything. I don't think the cost is the issue, the fact is that her dad wanted to have a very special party for her and he did."

The bands were paid. Titanium often played at such events, she said.

While the party is reminiscent of those featured in the television show "My Super Sweet 16", she said the birthday girl did not receive a new car as a gift.

"There were no Porsches, no Range Rovers."

"It was just a party for family and friends. Yes it was a big party and it was a fun party but the party was the gift."