Breslin appeared in her first commercial when she was only three years old and in her first film, Signs (2002), at the age of five.

Her subsequent films include Little Miss Sunshine (2006); No Reservations (2007); Nim's Island (2008); Definitely, Maybe (2008); My Sister's Keeper (2009); Zombieland (2009); Rango (2011); The Call (2013); August: Osage County (2013); and Zombieland: Double Tap (2019).

Her TV work includes "NCIS", "Law & Order: SVU", "Ghost Whisperer", and "Grey's Anatomy". She played the role of Libby Putney on "Scream Queens". She also played the role of "Baby" on the televised version of Dirty Dancing.

She has been nominated for many various awards and won seven of those. This includes winning two Critics Choice Awards, a Screen Actors Guild Award, and two Young Artist Awards.

In April 2017, Breslin came forward and revealed that a partner with whom she once shared a relationship had raped her, and she has since been diagnosed with PTSD. She continues to advocate on behalf of victims of sexual assault.

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