Justin, Lara Stone go topless for ad

Singer Justin Bieber has flaunted his toned physique in a topless shot with supermodel Lara Stone for an ad campaign.In the new Calvin Klein advertisement, Stone, also topless, is seen wrapping her arms around Bieber’s naked torso, reports dailymail.co.uk. The campaign was unveiled Tuesday after months of rumours circulating that Bieber was being lined up to become the new face of Calvin Klein.