It's as easy as using small nails, according to Martha Stewart. You simply nail them into the center of each foot and paint away. It allows things to dry 100% without running the risk of scratching the top of your piece.
You can try this trick on almost any piece of furniture. Even large heavy dressers or bed frames. The nails are stronger than they seem, just make sure you hammer them in as level as possible. Even if you aren't painting the bottom of each foot, it allows you to work right down to the floor without painting it!
Image: Martha Stewart