Justin Bieber has surprised customers at a small pub in New Zealand, delivering an impromptu piano performance while visiting the venue late last week.

The US pop star confirmed his New Zealand holiday on social media, sharing dozens of snaps including one of himself in front of a pub piano.

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The venue was later identified as the Duke of Marlborough Hotel in Russell, with the co-owner confirming Bieber unexpectedly appeared with a small group of friends last Thursday.

The Baby singer reportedly serenaded patrons with a purely instrumental performance without any of his own songs, raising the lid of the piano to conceal his identity from pub-goers.

“He was just after a few beers and some snacks, and he saw our baby grand piano in the corner, and he just jumped on and started knocking out a few tunes,” Duke of Marlborough co-owner Anton Haagh told RNZ.

“It was a lot of modern music, but he wasn’t singing, he was just playing the piano,” he added.

Haagh said that only a handful of customers noticed Bieber was at the pub, and that staff were encouraged to give him and the group space. Before leaving, the pop star reportedly rang a bell to shout everyone a round of drinks.

Bieber is said to have left the venue shortly before “30 or 40” fans turned up after getting wind that he had made a surprise appearance.

The singer documented his brief New Zealand holiday on Instagram this week, including photos of himself golfing, swimming, fishing and boarding a helicopter for some breathtaking views.

Though his social media posts confirmed it, Bieber’s New Zealand visit was only rumoured last week, when he was spotted playing golf at the Tara Iti Golf Club in Mangawhai.

The pop star was reportedly joined on the holiday by Australian entrepreneur Nick Molnar, who founded Afterpay, as well as his pastor – though his wife, Hailey Bieber, did not join them.

Bieber’s last New Zealand tour was back in 2017, as part of his Purpose world tour that also included stops in Australia and across Asia.