Do you think all millionaires live in big houses on exclusive islands and hang out with celebrities all the time? It is time to think again. In fact, your next door neighbor can be an invisible millionaire. You will be surprised how many millionaires live modestly and without pretense. They are happy to live below their means and grow and enjoy their wealth quietly. Are you interested in joining their league? Below are some tips you can incorporate in your life to be a simple millionaire, too.