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Justin Bieber looked sizzling hot as he went for a shirtless workout at DOGPOUND after becoming the first artist on YouTube with the most subscribers.

The pop singer showed off his impressive tattoo collection as he bared his toned abs showing off a glimpse of his Calvin Klein underwear.

Sources reveal that he stayed at the boutique gym for at least an hour and was extremely focused as he used a stretch band to work on his back and shoulders.

The singer wore a pair of black shorts paired with white Supreme tube socks and retro-style New Balance sneakers.

His wife Hailey Bieber was busy at a studio across town as Justin got his workout on during a class with other students.

The YouTube sensation got his start on the streaming channel and is probably the most famous singer to come out of there which explains how he just became the most followed artist in YouTube’s history according to Forbes.

The Canadian crooner just amassed 45 million subscribers as his fame continues to skyrocket with the popularity of his recent collaboration with Ed Sheeran, I Don’t Care, which has him again at the top of the charts.

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However, all this recent success has apparently not lifted the singer’s recent depression since sources cite he’s been in a down mood in recent days.

It would be hard to tell from Bieber’s Instagram page where everything seems to be fine in paradise.

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