Justin Bieber Shows Off His Muscles In New Behind The Scenes Pictures

5 November 2012, 14:28 | Updated: 5 November 2012, 14:36

The 'Beauty And A Beat' singer flexes his biceps backstage at a show this month.

 Justin Bieber has been showing off his hard work in the gym in a series of new pictures of him flexing his muscles.

The 'Boyfriend' singer, who is currently on tour across North America, posted several shows of himself in a white vest posing backstage at a concert while flexing his biceps.

"JB you think you jacked or sum???" the picture's caption reads, which already has over 16,000 comments so far.

Earlier this year the Canadian pop star said he has been stepping up his workouts in the gym in an afford to "get some guns going on".

View a picture of Justin Bieber in a vest below (Credit: Instagram):

At his concert in Houston, Texas last week Justin also showed off his latest tattoo, a design of an owl across his left forearm.

Justin Bieber shows off his muscles in the picture below (Credit: Instagram):

Justin Bieber is set to announce new details about his brand new fragrance Girlfriend later this week.