Buff Bieber! Justin goes from scrawny to ripped as he poses shirtless with his personal trainer

He's been working hard to take his body from scrawny to muscular.
So to show off the progress of his training regime, Justin Bieber delighted fans worldwide when he went shirtless and posted a cheeky selfie on Instagram on Wednesday.
The 19-year-old displayed his impressive biceps and defined six pack in the image, which he shared alongside the caption: 'Me and my trainer'.

It's Buff Bieber! Justin went shirtless as he posed up with his personal trainer in a shot posted on Instagram on Wednesday

And Bieber's millions of followers were quick to comment on the buff shot, with many complimenting the singer on his new look.
Wearing a baseball cap and low-slung shorts, Justin is seen pointing at the man responsible for his new physique - flexing his arm muscles in the process.
Speaking previously about his hopes for a body transformation, Bieber said: 'I have been working out in the gym, getting bigger, trying to get sexy for the ladies.'

Loving it: Justin is a fan of going shirtless at his shows, as he proved while performing in Beijing last month

Defined: Bieber has said before he wanted to work on his muscles to 'look sexy for the ladies'

Bieber's sexy selfie came as a sneak peek of his upcoming new track Rollercoaster was made public, with many fans taking to Twitter to comment that the passionate lyrics could be referring to his former relationship with Selena Gomez.
Lyrics from the track, which fans can hear in full on October 14th, include Bieber referencing a 'twirl around and around for a ride back' - perhaps commenting on the on-again, off-again status of his romance with Selena.

 
It's not the first time Bieber has used the romance as inspiration for a song.
In his most recent single Heartbreaker, which has hit the top spot on the charts in 52 countries worldwide, the singer waxes lyrical about a lost love, singing: 'You say that you don’t wanna talk but it’s cool.
'Been thinkin’ about you all day long, hopin you’ll pick up your phone, And I know that I don’t wanna lose your love.'
Bieber is currently enjoying a few days off before he jets to Puerto Rico to perform in San Juan on 19th October.