Joe Jonas and Charlotte McKinney strip down for Guess campaign

Singer Joe Jonas and Charlotte Mckinney have stripped down to their underwear for a new Guess campaign.

The DNCE singer and model/actress Charlotte were chosen as the models for the 2017 spring underwear campaign and in photos for the fashion shoot, they show off their fit physiques while modeling the new products.

"It's been a fun shoot and my first time doing (an ad) in underwear, so it's pretty exciting," Joe tells E! News, explaining he worked hard with his trainer and dieted to get in shape for the the session. "She put me through the ringer," he says. "(We did) a lot of boxing and cardio."

However, he was still nervous to show off his body.

"It can be a weird thing to be sitting there in your underwear being photographed, but overall I had a blast," he continues. "Everybody on set was great."

Meanwhile, Charlotte was excited to work with bosses at the fashion label, because she considers their past campaigns to be "iconic" and "sexy."

"Even though I've been doing this for four years now, I still have to pinch myself coming into work."

Joe and Charlotte previously teamed up for his group's Body Moves music video in October (16). The video featured Joe shooting what appears to be the start of a sex tape with Charlotte. In the black-and-white opening footage, Charlotte wears a white bra top and jeans as the camera zooms in on her breasts, and Joe goes topless as he reclines on a bed, with the beauty climbing on top of the singer and straddling him.

The video then cuts to the band performing, while clips of Joe and Charlotte kissing are interspersed throughout the promo, which also features the pair getting frisky in an elevator, as the model suggestively poses by the star's crotch.