Everyone promised you that your hair would be ultra-full and thick when you were pregnant. But the only thing that fits that description is your butt. Trade in your regular shampoo for a grapefruit-infused one. Citrus oil, particularly grapefruit, is known to soften and shine hair. For less than 10 bucks a bottle, it's a cheap way to make you feel gorgeous again (even if your butt is the size of a sofa).