Mark Wahlberg? More like Mark “Brick Wall”-berg…

We’ve seen a lot of shirtless Wahlberg in Miami while he’s filming the upcoming bodybuilder action flick, Pain & Gain.

Some are speculating that he’s shooting more than just a movie.

We’re talking steroids, bro…

Nah! Wahlbergs rep reportedly says the star has never juiced up before, but since he’s playing a roid-abusing gym rat, he accepted the challenge to look like one.

Just lots of eating… and lots of training…

Plus, with Dwayne Johnson as his co-star… His gym partner probably knows his way around the weights…

Infact, if Wahlberg does need some motivation for a gym sesh… He doesn’t need the ‘roids… He just has to look at “The Rock.”