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15. Hailee Steinfeld

Who: Hailee Steinfeld
What: Actress
Why she's an 'It' girl: Hailee made a name for herself amongst Hollywood's biggest players with her performance in True Grit at only 14-years old, earning her nominations for the Academy Award for Best Supporting Actress, the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Supporting Role, and the BAFTA Award for Best Actress in a Leading Role. After appearing in Pitch Perfect 2, Hailee signed with Republic Records and released her debut EP in 2015.