Watch: Justin Bieber wows with sexy underwear ads

Justin Bieber has sure grown up! He’s boasting manly bulges in all the right places.

The 20-year-old bad boy singer has unveiled his new campaign for the iconic Calvin Klein underwear and jeans brand.

The star posted the first images from the campaign photoshoot on Instagram on Tuesday. Video ads were also released online.

Snapped by hot fashion photographers Mert Alas and Marcus Piggot, the black and white images are reminiscent of the iconic 1990s Marky Mark campaign for Calvin Klein.

And, just in case we forget that he’s a full-blooded heterosexual, the Calvin Klein jeans campaign also shows Bieber getting saucy with model Lara Stone.

Either way, we can’t deny that the Bieber is most-certainly looking good these days.