The film centers on best friends Sara (Amanda Michalka) and Jacquie (Regine Nehy). They share everything, including the same birthday, which they always celebrate together. Sara and Jacquie start making plans for a huge "Sweet 16" party for the both of them, all with proceeds going to a charity called "Hollywood Heart". However, when Jacquie transfers to the school Sara goes to, a rich girl called Taylor makes friends with Jacquie (because Taylor never had a sweet sixteen) and then proceeds to change Jacquie to be more like herself in order to destroy Sara and Jacquie's relationship. Jacquie unwittingly falls into her plan. Sara tries to deal with Jacquie's personality change until Jacquie starts insisting to make Taylor a party planner, something that Sara hates. This leads to many more arguments until finally, the two split the party and compete with each other to have the biggest party, all while insulting each other. At the same time, an unexpected romance occurs between Shannon, Taylor's brother, and Sara.
Cassie plays a girl called Sophie, one of Sara's friends. It's a small but very funny role. It is definitely worth the watch.
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