As Tyra Banks loves to remind us, modeling is hard, okay? Sometimes you have to sit in chairs for really long amounts of time while people make you look pretty, and sometimes you even have to get out of those chairs to stand up and move your arms and stuff. But after seeing these pictures of Gisele Bundchen getting her ass squeezed by a fluffer while shooting a fashion spread, it turns out we didn't know the half of it. Apparently, sometimes, models even have to endure butt massages while they work! A closer look at Bundchen's behind, and the men assigned to perfect it, after the jump.