When aspiring actress Polly's identical twin sister Amy lands a breakout role in a hit TV show, Polly's own dreams of stardom are overshadowed. Mistaken for her famous sister at every turn, Polly decides to use Amy's celebrity for her own gain, accepting free clothes, booze, and even casual sex. But as her deceptions pile up, Polly's attempts to bask in her sister's spotlight lead to hilarious and disastrous consequences for them both. Will Polly find her own path to success, or will her efforts to mimic Amy ultimately backfire?

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Some movies that have similar genres and were produced around the same time as That's Not Me include St. Vincent, The Intern, Last Vegas, Government Woman, We Are the Nobles, Booksmart.