Aloha, lovebirds! Nick Jonas and girlfriend Olivia Culpo, along with Joe Jonas and girlfriend Blanda Eggenschwiler, soaked up some rays while vacationing together in Hawaii on Monday, Jan. 6, two days after attending a pal's island wedding on Jan. 4. See more shirtless pics of the Jonas brothers.
Nick, 21, went shirtless for the couples' beach outing in Kauai, wearing just a pair of printed board shorts and aviator sunglasses. He looked lean and happy as he relaxed with Miss Universe 2012 Culpo, also 21, who rocked a red-hot bikini.
Of course, this is not the first time the "Higher Love" singer has made headlines for his physique. Last July, fans swooned when he shared a post-workout photo of himself via Instagram.
"I never do this, but..." the pop star wrote in the caption at the time, alongside a picture of himself showing off his six-pack abs and bulging biceps. "Healthy living and fitness update. Post workout picture. #diabeticinshape #2.0."
A few months later, the Careful What You Wish For actor talked to Men's Fitness about his diet and fitness regimen. "I worked with a trainer who showed me some things that I can take with me on the road," he explained of how he bulked up. "Basically, it's circuit training, so about six exercises, all targeting different parts of the body and then following it up with a two-minute cardio burnout. It's been a really effective workout routine for me, and it keeps it interesting."
"It's really about just staying on top of it and managing every detail," he added. "I had to work with my doctor, making sure all my numbers were good and that I wasn't putting too much stress on my body working out as much as I was. When I work out, my blood sugar goes up. But then about an hour and a half later it drops down low. So, post-workout I would have to not only have protein to rebuild muscle but also carbs to sustain my blood sugar. So when I cut a lot of carbs out of my diet, I had to be conscious of that."