Diego Boneta beach ocean shirtless miami

Diego Boneta is enjoying some down time while filming Rock of Ages in Miami with his sexy co-star Julianne Hough.

The 21-year-old hottie, who has starred in TV shows like 90210 and Pretty Little Liars, has been working hard in the hot sun to maintain his lean physique. We have a feeling director Adam Shankman is making sure his cast is keeping their bodies in rock hard condition throughout the production.

Boneta has to be one of the luckiest guys on the planet to be making out with Julianne Hough on the job. We know Julianne's beau Ryan Seacrest isn't jealous, but we are!