Justin Bieber at the SAP Center

bieber0316Aidin Vaziri | Justin Bieber is determined to win back his fans — whatever it takes.

On his Purpose world tour, which arrived at the SAP Center in San Jose on Thursday night, the fallen pop idol serenaded them with an acoustic guitar, dazzled them with elaborate dance routines, showed off his drumming skills, did backflips on a trampoline suspended over their heads and fell on bended knee to hold their hands and whisper sweet nothings in their ears.

Oh, and in case that didn’t do the trick, Bieber closed the 90-minute set by ripping off his shirt and walking through a waterfall — yes, right there onstage — as he grabbed his crotch and mouthed the words to his irresistible tropical house hit, “Sorry.”

“I’m so lucky to be doing this,” said the 22-year-old Canadian singer, with as much solemnity as he could muster on the fifth date of the tour, which will hit 58 cities in all (including Oracle Arena in Oakland on Friday, March 18).

Things are looking up for Bieber following a turbulent spell that kept his name in the tabloids for everything from abandoning his pet monkey in a German airport to kicking a member of the paparazzi.

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