Photoshop, definately.
I don`t know about that, I went to a strip club once where I saw a girl who had knockers just as big as that, it was freggin` crazy, and when she bent over at the waist and let them hang down, everyone was freaking out because they looked like they were going to rip right off her chest. They looked like two huge balloons streched to their limit with all the fluid on the bottom. That would have been something, "Call the EPA we have a major silicone spill!" I can just imagine how stretched her skin was if she ever got them taken out, she could probably tie them into knots.