Got a sweet tooth? You’re in luck. These days, cupcakes are playing a starring role at pastry shops across the country – from teen-owned business City Cupcakes, to Zoe's Place, a nonprofit organization that provides services and support to teen mothers or mothers to be. Oh, and don’t forget the excitement of The Food Network’s "Cupcake Wars", delicious and dripping with drama. These sweet treats have become more than just a passing fad.…