Attention Britney Spears fans! Christmas has come early and we're about to tell you why. For those of you who were around during the good ol' days that were the late 90s/early '00s, you will recall that there were two kinds of people - Pepsi fans and Coca-Cola fans. Both brands had successful marketing campaigns and garnered large fan followings, including celebrities. But at the start of the millennium, it was Pepsi that had the upper hand in the legendary rivalry, also known as the "Cola Wars."NY Daily NewsPepsi recruited some of the most popular celebrities at