Rooney Mara
The Carol actress might be a big star nowadays, but back in 2005, Rooney Mara was only known as Kate Mara's little sister. Mara earned her first IMDb credit while visiting her sister on the set of Urban Legends: Bloody Mary (2005), in which the vengeful spirit of a dead student terrorizes her peers on prom night. Mara played "Classroom Girl #1."
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