Sierra is a little diva who wants what she wants, which includes having a Sweet 15 party so she can be the first among her friends to celebrate their coming of age. But when her grades start to dip, Sierra's mother and father (rapper/producer Cee-Lo) cancel her plans and tell her to get her act together. Will she be able to earn back her parent's trust and have the ultimate birthday celebration or will Sierra's 15th birthday be more sour than sweet?