Billboard Music Awards
Justin Bieber performs a medley of songs at the 2016 Billboard Awards in Las VegasREUTERS

After Baywatch's Zac Efron, now Canadian singer Justin Bieber is flaunting his abs. The new hottie in the town, who is busy with his Purpose Tour, showcased his fit body when he came out of the Rumble Boxing on West 23rd Street shirtless.

Bieber is making sure that he is going to gym regularly to maintain his athletic physique. On Sunday, he was spotted leaving the Rumble Boxing studio with his T-shirt on his shoulder. The singer wore a low-slung Orlando Magic basketball shorts with his yellow hoodie on the shoulders.

Also Read: Justin Bieber to cancel his UK gigs following Manchester attack?

The Canadian heartthrob also showed his tattooed torso, including a large crucifix in the centre of his chest, a lion with a crown over his heart and a giant eagle tattoo on his abs. He has been regularly attending gym early-morning at Rumble Boxing on West 23rd Street.

"Justin didn't request private sessions, he joined in the group classes. He had no security and was seen high-fiving other gymgoers, dancing and singing to the hip-hop blasting out between rounds of bag-punching and weights," Page Six quoted a source as saying.

Bieber is a boxing fan and draws inspiration from the undefeated champion Floyd Mayweather. He is an old friend of Mayweather and even carried his belt to the ring for his $300 million fight against Manny Pacquiao in 2015.

And interestingly, he began his boxing training with Mayweather when he was just 16-year-old.

Meanwhile, the Sorry singer is currently busy with his Purpose Tour and visited India on May 10 for his concert. The singer is also expected to perform in the UK in future, but after the Manchester bombing on Monday at Ariana Grande's concert, his fans are requesting him to cancel his UK tour.

His fans have requested his manager Scooter Braun, who is also managing Ariana, to cancel the July 2 event.