The idea behind the trend is exactly how it sounds: You use a bar of Pear soap to shape and set your brows in place. While the trick has been repopularized by beauty bloggers, it's actually a classic makeup artist and drag queen technique that's been used on photo shoots for years. Aside from being insanely cheap, soap is perfect for getting those really fluffy, brushed-up, model-worthy brows that gel alone can't quite achieve.