Someone has been hitting the gym!
DNCE's Joe Jonas is one of the stars of the new GUESS underwear campaign.
Shot by photographer Yu Tsai, the pics show 27-year-old Jonas in various pairs of underwear -- including many shirtless shots that call attention to his oiled and shorn chest and washboard abs (and more).
For some images, Jonas poses with model Charlotte McKinney.
Yu Tsai / GUESS
Yu Tsai / GUESS
Jonas told E! that to prep for the photo shoot, he did a lot of boxing with a trainer. "It's been a fun shoot, and my first time doing [a campaign] in underwear, so it's pretty exciting.
"It can be a weird thing to be sitting there in your underwear being photographed, but overall I had a blast."
Yu Tsai / GUESS
Yu Tsai / GUESS
Yu Tsai / GUESS
Joe is the first Jonas brother to star in a sexy underwear campaign -- although younger brother Nick Jonas posed in Calvin Klein undies for a 2014 feature in Flaunt magazine.
On social media, fans are reacting to Joe's pics and pecs!
Adapted from an article at iHeartRadio