Will Ferrell kept it cas(ual) on the set of Step Brothers in some pj pants and Crocs (ew) over the weekend. In the movie Will and John C. Reilly play competitive step brothers and judging from this wardrobe, it should fit quite nicely in the Will Ferrell Genre. Will was giving The United Way props with his shirt, but he's got another charity close to his heart these days. He is auctioning off a cameo in this movie on eBay with the proceeds going to his good friend's cancer foundation. Aw, there's nothing better than a funny sweetheart and, as he was quick to point out, a big screen moment would make quite the holiday gift. Some face time with Will Ferrell is worth a few cool grand, right?