Calm down everyone, it’s not Zac Efron so let’s just get that out of the way. But one of these two High School Musical stars is in the buff for their upcoming role in the upcoming thriller Nurse 3-D. But who is it: Corbin Bleu or Lucas Grabeel. First, let’s learn a little bit about the new film.

Directed by Doug Aarniokoski and starring Paz de la Huerta (Abby Russell) and Katrina Bowden (Danni), the thriller tells the story of two medical assistants who lure cheating men into a deathly trap. Wow. This puts the idea of Cheaterville to shame huh? The former High School musical star plays a paramedic at the hospital (and Danni’s boyfriend) who “becomes entangled in Abby’s murderous web”.

Also starring in the thriller are former DWTS celeb Niecy Nash and Judd Nelson. While promotion for the film has begun, it probably won’t be released until mid to late 2012 as filming only wrapped in Toronto at the end of October. But back to the question at hand: which one of these men is dropping trou for the film? Find out below.

It’s Corbin Bleu. “I will be naked in 3D. It should be interesting,” he told Us Magazine in a recent interview. So how did he tone up for the new role? “I did a lot of really strict eating – pretty much no carbs (carbohydrates) of any sort. No pasta, no rice, no bread. My trainer worked me like a dog. I did lots of interval training and lots of weights.” But you can tone down the excitement just a bit as Corbin admits, he won’t be going full frontal. “You see my rear end. It’s tasteful. It’s done well.” Rear end is just fine with me Mr. Bleu. Will you be checking out Nurse 3-D next year?