Mark Wahlberg and Dwayne "the Rock" Johnson cover Muscle & Fitness (May 2013) to plug their flick Pain & Gain.

Wahlberg's workouts for the film sound brutal:

"I was training five days a week. I'd start with benching, and then I'd do my squats and my lunges, then I'd do a lot of old-school stuff. I'd literally do a row of machines at the Sports Club/LA. One set of every single machine all the way down the row. I'd leave the hotel at 4:30 in the morning—just as the nightclubs were letting out on South Beach. I'd walk in the gym as the door opened at 5:00 a.m. every day."

When did he find any time to juice?

He strikes me as not a pleasant guy (racism and robbery in his past), but he sure has the sexy part down. I've told this story before, but when he was a teenager and signing his infamous book that he dedicated to his dick, he graciously signed a tear sheet I had from Smash Hits (UK) in which his brother Donnie was pulling Mark's underwear down to reveal his bare ass.

So he can't be all bad.

"No autographs—please!"

This is the fifth in a series of articles from The Underwear Expert

As 2012 comes to a close, it's time to look back fondly at a year jam-packed with celebrities showing their underwear in public. The Underwear Expert keeps track of all the celebrity underwear sightings you could possibly care about so that you can keep tabs on who is wearing what, who is looking decent and who needs some serious undies advice.

With dozens of underwear sightings this year, it was tough to narrow them down, but we've come up with a list of the Top 5 celebrity underwear sightings of 2012. These were the most controversial, interesting, hilarious or popular sightings of the year. Check out our Top 5 sightings below and let us know which were your favorites...

UPDATE: Wahlberg has apologized, calling his words "irresponsible." 

People like to talk about celebrities' big egos, but this goes way beyond believing one's own publicity! Mark Wahlberg, who apparently narrowly missed being on one of the 9/11 planes, now says if he'd been on it, things would have been different:

"If I was on that plane with my kids, it wouldn't have went down like it did. There would have been a lot of blood in that first-class cabin and then me saying, 'OK, we're going to land somewhere safely, don't worry.'"

Wow. So apparently the people on those planes just didn't love their children as much as he loves his, and/or were stupes for not realizing the terrorists were intending to fly those planes into buildings. Beyond idiotic.

A funky bunch of pictures

Tabloid Heat has a great "Brief History of Mark Wahlberg's Best Naked and Shirtless Moments." I'm a big fan of his body even if I think he's marginally talented and seems to be quite an unpleasant person (those pesky racist bashing incidents from his teen years, his initial lack of graciousness over SNL's funny parody).

But I actually met Wahlberg when he was Marky Mark.