Bieber and Stone kiss - for ad
Justin Bieber and Lara Stone share a steamy clinch in a new Calvin Klein ad.
The unlikely couple star in the brand's latest campaign.
In one ad for Calvin Klein jeans, supermodel Lara, 31, who is married to comedian David Walliams, sits astride the topless, 20-year-old pop star, who is lying on the floor.
Another begins with Justin - again topless - showing off his drumming skills, while Lara is seen wearing nothing underneath her open shirt.
The pair then embrace, placing their hands all over each other, and Justin leans in for a kiss.
Other black and white shots include the tattooed Boyfriend singer flashing his Calvin Klein white underwear, and Lara, who appears to be topless, wrapping her arms around the star.
Justin paid tribute to another former Calvin Klein model Mark Wahlberg, writing on Twitter: "Just spoke to my boy @mark_wahlberg. Honoured to be a part of the legacy. @CalvinKlein #mycalvins."
Mother-of-one Lara, a regular Calvin Klein model, wrote: "Back at it with @justinbieber! First look at our @calvinklein Jeans + Underwear campaign. #mycalvins."