Last July, Calvin revealed the secret to his killer physique on Instagram, when he showed off his six-pack abs.
"Staying in a gym routine while on the road is tricky, but as long as you don't drink, eat well, sleep enough and take one of those mad little ab rollers with u everywhere you'll be good," he wrote.
And it seems like Harris could do no wrong these days. Aside from everything appearing picture-perfect with his girlfriend, Taylor Swift, he's also just been announced as a Coachella headliner this year. Harris will be performing on April 17 and 24 in Indio, California.