Seyfried began acting at age 15, with a recurring roles on the TV soap operas “As the World Turns” and “All My Children”.
In 2004, she transitioned to film acting with her breakthrough role as ‘Karen Smith’ in the teen comedy feature “Mean Girls”.
She found further success with leading roles in the musical “Mamma Mia!” (2008), the horror comedy “Jennifer's Body” (2009), the romance drama “Dear John” (2010)…
…the sci-fi action film “In Time” (2011), and the recent psychological thriller “The Housemaid” (2025).
Seyfried expanded into dramatic roles with performances as ‘Cosette’ in “Les Misérables”(2012), as ‘Linda Lovelace’ in “Lovelace” (2013), as a pregnant parishioner in “First Reformed” (2017), and as ‘Ann Lee’ in “The Testament of Ann Lee” (2025).
For her portrayal of ‘Marion Davies’ in the biopic drama “Mank” (2020), she earned a nomination for the ‘Academy Award for Best Supporting Actress’.
On television, she starred as Sarah Henrickson in HBO's “Big Love” (2006–2011) and ‘Elizabeth Holmes’ in the Hulu limited series “The Dropout” (2022), earning a ‘Golden Globe Award’ and ‘Primetime Emmy Award for Outstanding Lead Actress’.
She has since led the Apple TV psychological thriller “The Crowded Room” (2023) and Peacock crime drama “Long Bright River” (2025).
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