Think you don't need a prenup because you're not rich and famous? You may want to think again. Erin Lowry, author of 'Broke Millennial: Stop Scraping By and Get Your Financial Life Together', compares it with auto insurance. You want to protect yourself from others whom you have no control your future spouse. Millennial prenups are becoming more common, but what should it include? Lowry says to make sure all your bank accounts (even joint ones), property and retirement funds are accounted for. Plus, she suggests doing your research to see what your state's laws are when it comes to splitting assets during a divorce.