Was Justin Beiber re-touched for 'bigger bulge' in this Calvin Klein ad?

Justin Bieber appears very toned and muscular in his recent campaign photos for Calvin Klein. However, the singer's physical appearance has since been criticised, with others claiming airbrushing was done to achieve his ripped abs. Justin Bieber is the new face, and abs, of Calvin Klein Jeans and Calvin Klein Underwear. The Canadian-born singer is featured alongside Dutch supermodel Lara Stone in the brand's Spring 2015 campaign and admitted being involved is "a dream come true."