Mark Wahlberg stripped down to a red pair of shorts and soccer sandals today on the Miami set of his latest project, Pain and Gain. He's teaming up with Dwayne "The Rock" Johnson in a story about a group of bodybuilders who get mixed up in a kidnapping that goes wrong. Mark looks like he's been working out to get ready for the role, and his partner in crime, The Rock, has likely been hitting the gym in preparation for his return to the ring. The Rock is coming out of retirement for this weekend's Wrestlemania XXVIII. He's taking on his long-time enemy John Cena on Sunday night with other famous names like The Undertaker and Chris Jericho expected to participate in the televised event.