Justin Bieber's Calvin Klein photos were reportedly retouched to make his manhood look bigger *shudders*. OK, that's bieleberal (apologies), but how did they, eh, enlarge his scenario in the ad? It must be a cup...

Hang about - the 20-year-old singer - who has been unveiled as the face of the brand's latest underwear adverts alongside Lara Stone - is also said to have had his biceps, back muscles and thighs enhanced by photo-editing experts. Again, how did they do this in the ad? They must've had him crawl into a muscle suit, or something.

In yet more surprising news, 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." Somewhere, David Walliams is drooling - either in a blind rage or a state of ecstasy.

The claim comes shortly after Justin said his impressive-looking physique was all down to hard work - like lunges, 'n stuff. The singer 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!"

Who hits on married women - yaaaaay!

Watch: Near naked Bieber plays drums/paws at Lara Stone (AKA Mrs Walliams) in Calvin Klein ad