On 21 April last year, Tavi Gevinson turned 21. The date happened to be the one-year anniversary of Prince’s death, so to mark her birthday, Tavi rented a cinema at the Anthology Film Archives in New York’s East Village and screened a 35-millimetre print of Purple Rain for her friends. If this sounds like an untypical celebration, rest assured: afterwards they ate cake and partied in bars. The evening’s divide is classic Tavi. Since her career began nearly a decade ago, when she was 11 and launched her fashion blog, Style Rookie, Tavi has been half normal young person – going through high school, leaving home, moving to New York, eating cake on her birthday – and half entirely exceptional young person, famous from childhood, apparently old beyond her years. The kind of person who screens Purple Rain on her birthday.