Nope, it's sure not photoshop. They did an on the set interview with him on extra I believe, and he looks GREAT. Huge pecs, small waist, huge arms, and even though he was wearing a shirt, you could tell the bodyfat was low, because the arm was veiny.
Also, go check a book store, they have a special t3 mag, and it has on the set pics showing the same thing. Unless Extra or Acces Hollywood is using photoshop while doing live shows, then it's all him.
Besides whats so hard to believe. His t2 shape is impressive, but not his t1, conan, etc shape. I can easily believe a man with his muscle memory and incredible genetics could get into that shape easily.