Men are sometimes challenged to dress casually without looking sloppy -- or like a teenager. Casual dressing can be as easy as pulling on a pair of jeans, though. The trick is knowing how to balance the proportions of your outfit, and sometimes what pieces to put together with your easy denims. Here, we offer some casual day fashion inspiration for men. Take a look at our photo gallery of celebrity men who know how to dress down, without sacrificing style, including tips on how real men can do the same.