Opinion | Justin Bieber's all grown up in new Calvin Klein ad

Last Friday, London Collections: Men kicked off the 2015 fashion calendar. And as much as our attention turns to the male models on the catwalks of the British capital, there is another guy commanding more than his fair share of industry attention.

Justin Bieber, platinum selling phenomenon and bratty superstar, is the new face of Calvin Klein Underwear and Calvin Klein Jeans. As much as I realise that he is the stuff of many teenage girls' dreams, there are some of us who couldn't quite picture the Bieb's naked torso peeking from those iconic white, lettered waistbands.

There are also those who still can't shake the skinny baby-faced 14-year-old from our minds. But child-no-more Bieber is out to show the world what puberty and having a seriously well-equipped home gym can do for a young frame.

The former child star has tattoos on both arms, with a cross etched into the middle of his rather buff chest. His body, toned to perfection, flashes some serious guns and abs.

The moody black and white ads show Bieber entangled with Calvin Klein regular, the blond and buxom Lara Stone, who I'd imagine would eat him alive. Shot by noted photographic duo Mert & Marcus, the campaign is a coup for those at Calvin Klein who are increasingly eyeing the younger demographic.