Mario Lopez vows to keep his shirt on...

Say it ain't so!

Mario Lopez, as well known for his buff body as for his acting and hosting skills, tells People.com: "My shirtless photo-shoot days are behind me...My TV projects are my main priority. And no, you will never see me host Extra without a shirt."

But Mario is returning to FX's "Nip/Tuck" as Dr. Mike Hamoui. You remember, he's the guy who Christian (Julian McMahon) was eyeing in the shower in season four.

Says Mario: "Dr. Mike might not be taking anymore showers at the gym with Christian, but he will lose his shirt."

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Meanwhile, Nick Adams just posted pictures (below) of he and Mario on his Facebook page. They starred together on Broadway this summer in "A Chorus Line" and there was some controversy early on because Mario reportedly didn't want his buffness overshadowed by Nicks.

And finally, here's a video of a shirtless Mario taking a run around town...