Mark Wahlberg
Given 2 months to prepare for his role in the movie Pain & Gain as a bodybuilder, Wahlberg was keeping busy catching up in size to his co-star Dwayne Johnson. He packed on as much as 40 pounds eating up to 10 meals a day. Even though he has eased off a bit, the hard work he put into bulking up is still visible every time he appears on-screen.