A staple in any woman's wardrobe, the casual dress is the best way to brighten up a day. This kind of dress is perfect for those moments when you want to step up from pants, shorts and blouses to a more feminine look, while still keeping it fun, accessible and low-key. We've put together a list of the most trendy, flattering and fun casual dresses worn by celebrities, and also suggested some more affordable alternatives that look just as good.