For most kids, the best part of heading back to school is all the shopping that goes along with it. Exciting, yes. But add it all up and those cozy fall sweaters, skinny jeans and jackets can be painfully expensive. Thankfully, we've got some good news. To kick off the school year, a whole slew of young celebrities have designed trend-driven, affordable lines that are sure to please fashion-forward shoppers and their parents.