Rise to Fame
She's said she started modeling at 11 because kids at school called her 'Casper the Ghost,' which makes her breakout as the sweetly dim Karen Smith in Mean Girls (2004) feel like poetry. The role saved her before her career properly started, her words: 'Oh, thank God for Mean Girls! That put me on the map!' Mamma Mia! (2008) was a different scale. It was her first actual top-billed role, the fifth highest-grossing film of that year, and proved she could carry a tentpole rather than just scene-steal from Lindsay Lohan.
In the Spotlight
The Dropout (2022) is where she stopped being a movie star and became something more interesting. Playing Elizabeth Holmes, the convicted Theranos fraudster, earned her a first Emmy, a Golden Globe, and an Oscar nomination. She called it 'the best time of my life' and then admitted she was completely over Holmes by the end, which is either compartmentalization or discipline. Long Bright River on Peacock in 2025 continued the prestige streak. Off-screen, she and her husband Thomas Sadoski converted their upstate New York farm into a registered nonprofit animal rescue with 40-plus animals, which tells you something about her priorities.
Side Notes
Before Mean Girls, she was appearing in print ads for Limited Too alongside Leighton Meester and showing up on three Sweet Valley High novel covers, which is a very specific late-90s cultural footprint. She's said she started modeling because being called 'Casper the Ghost' in middle school made her want to prove pale skin was actually a commodity. At 17, she quit and took a job as a waitress in a retirement community. That gap is in almost no press kit, but it fits a pattern: she tends to do the unglamorous work in front of her, whether that's mucking out stalls or disappearing into Elizabeth Holmes for months.