If you could write an open letter to your 18-year-old self, what would you say??  Stop caking on that makeup...Less is more...You're too good for him...Be nicer to your mommy because you'll be one someday and payback's a bitch :) Perhaps all those thoughts come to mind, but if you're A-lister Victoria Beckham, you also tell your younger self to believe in love at first sight because it truly does exist.  Posh opened up to British Vogue penning a letter to her younger self- and lemme tell ya, it's honest, beautiful and something all moms should share with their little girls.  Here's a look: