Justin Bieber's Calvin Klein photos were reportedly retouched to make his penis look bigger.

The 20-year-old singer - who has been unveiled as the face of the brand's latest underwear adverts alongside model Lara Stone - is also said to have had his biceps, back muscles and thighs enhanced by photo-editing experts.

Justin Bieber's Calvin Klein photos were retouched to make him look more muscular, a report has claimed.

What's more, a source connected to the shoot has claimed he behaved inappropriately on set, telling breatheheavy.com: "He was basically a douche. He hit on Lara several times and she had to stop him, basically calling him out on being just a child . . . Bieber specified he wanted to look taller and buff. Bigger bulge implied."

The claim comes shortly after Justin said his impressive-looking physique was all down to hard work.

The 'Boyfriend' hitmaker said: "I work out with my trainer, Patrick Nilsson, five days a week for about 45 minutes each. We do three days splits: back and triceps one day, chest and biceps on day two, shoulder and legs on day three, and abs every other day.

"I'm not on a special diet, but I do try to watch what I eat. I do eat unhealthy sometimes - I am a 20-year-old guy!"

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