At the end of *Justin Bieber *'s 90-minute set at *Perth Arena *on Sunday, the last show of his almost 160-date Believe world tour, I had one burning question.
How does he keep his pants up?
Biebs' gravity-defying trousers are a wonder of costume design, hanging so low he could be charged with indecency at any moment but not hindering in any way his energetic dance moves.
While the Canadian pop star never ended up pants-less, he did end up shirtless for the latter part of the show, resulting in ear-piercing screams from the crowd that was smaller and had an older feel than his sold-out show at *Burswood Dome *in 2011.
Perhaps many of the younger Beliebers have switched camps to become Directioners given Bieber's recent antics and bad press?
In fact, the 19-year-old arrived on stage positively overdressed in a multi-piece white suit, gloves, sunglasses and trainers for opening track All Around the World, accompanied by pyrotechnics.
Three songs in and Bieber had stripped off to a gold sleeveless top for the well-received medley of early hits One Time, Eenie Meenie and the high-energy Somebody to Love, a song that would have benefited from being played as a stand-alone track.
A video interlude followed, allowing Bieber to change into a red basketball T-shirt and high-top boots, twirling an umbrella for the highly choreographed, almost barbershop-styled, Love Me Like You Do.
The *will.i.am *featuring Bieber track * *That Power pumped through the Arena while a dozen dancers showcased their moves, then he was back for Die In Your Arms and Beautiful.
There were times when Bieber's vocal mix sounded tinny and squeaky (too much partying, or the fact he has been on the road since September 2012) but what has become obvious between visits is his voice is better showcased on the slower R&B and soulful numbers than the teeny- bopper pop hits.
The pace slowed down for the acoustic bracket, including Be Alright and Fall, with Bieber picking up a guitar and apologising if he seemed upset because it was the last night of the tour.
He again thanked his fans for their support ahead of his anthem, Never Say Never, then jumped up for a drum solo on the bouncy, upbeat Beauty and the Beat.
Bieber made the night of *Rockingham *teenage cancer survivor *Nicola Walsh *, bringing her on stage for One Less Lonely Girl.
The main set wrapped with a shirtless, tattooed Bieber crooning As Long as You Love Me and playing piano on Believe, with the avid gym-goer remaining shirtless for a dirty R&B encore of Boyfriend and the obligatory Baby, the song that launched his career.
Off stage Bieber may be a brat but on stage he delivered his hits with passion and energy, reaching out and thanking those who have stuck by him and paid good money for CDs, DVDs and concert tickets to help make him a superstar.
is better showcased on the slower R&B numbers than the teeny-bopper pop hits.