STOP WHAT YOU’RE DOING: Mark Wahlberg in his underwear!

Oh my gosh! Check out Mark Wahlberg in his underwear!

Photos have hit the net of the super-sexy 40-year-old actor filming scenes for black comedy Pain And Gain in Miami, Florida, wearing nothing but boxers and a vest.

We were going to say Mark looks just as hot as he did in his Calvin Klein ads back in the 90s, but he actually looks better – look how buff he is now.

Click here for photos. Warning: Dangerously sexy!