A Cappella just got a bit cooler.For starters, we don't need validation as to how cool singing in an a cappella group is. We're either currently living the glamorous life, or once upon a time did. But for those on the outside looking in, they often need a reminder.This slideshow by Zimbio highlights a few of your celebrity crushes and all-around cool people who sang in the coveted art form and were once upon a time, normal people like us.View the slideshow here: http://www.zimbio.com/Stars+Who+Sang+in+A+Cappella+Groups+in+College